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Amending Section 16-6-4 Flood Hazard Overlay District of the Unified Development Code_Hearing
City of Dubuque City Council Meeting Public Hearings # 1. Copyrighted June 21, 2021 ITEM TITLE: Amending Section 16-6-4 Flood Hazard Overlay District of the Unified Development Code SUMMARY: Proof of publication on notice of public hearing to consider City Council approval of a request from City of Dubuque to amend Section 16-6-4 Flood Hazard Overlay District of the Unified Development Code by repealing the current ordinance and adopting a new Section 16-6-4 Flood Hazard Overlay District, and Zoning Advisory Commission recommending approval. SUGGESTED DISPOSITION: ATTACHMENTS: Description ZAC Letter to Council Ordinance Flood Insurance Study ORDINANCE Amending Title 16 of the City of Dubuque Code of Ordinances, Unified Development Code, by repealing Section 6-4 Flood Hazard Overlay District and enacting a new Section 6-4 Flood Hazard Overlay District to comply with National Flood Insurance Program Requirements Suggested Disposition: Receive and File; Motion B; Motion A Flood Insurance Rate Maps (FIRMS) Current UDC Flood Regulations Ordinance Changes Staff Memo Maps of Structure being added and removed from regulatory floodplain Floodplain Topo Image (current & proposed) What is the NFI P? Suggested Motion Wording Type Staff Memo Ordinance Supporting Documentation Supporting Documentation Supporting Documentation Supporting Documentation Staff Memo Supporting Documentation Supporting Documentation Supporting Documentation Supporting Documentation Planning Services Department Dubuque City Hall THE COF 50 West 13t" Street;!!, Dubuque, IA 52001-4864 DUi!BE 1 1 ' (563) 589-4210 phone I I (563) 589-4221 fax zonzfzoirzoi3 563 690-6678 TDD ( ) Masterpiece an the Mississippi 2017*2019 planning@cityofdubuque org June 11, 2021 The Honorable Mayor and City Council Members City of Dubuque City Hall — 50 W. 13t" Street Dubuque IA 52001 Applicant: City of Dubuque. Description: To amend Section 16-6-4 Flood Hazard Overlay District of the Unified Development Code Dear Mayor and City Council Members: The City of Dubuque Zoning Advisory Commission has reviewed the above -cited request. The application, staff report and related materials are attached for your review. Discussion Planning staff said the request is to amend Section 16-6-4 Flood Hazard Overlay District of the Unified Development Code by repealing the current ordinance and adopting a new Section 16-6-4 Flood Hazard Overlay District to comply with National Flood Insurance Program requirements. Planning Services Manager Wally Wernimont discussed the text amendment. He noted that the City of Dubuque participates in the National Flood Insurance Program (NFIP) that is managed by the Federal Emergency Management Agency (FEMA). He noted that the City of Dubuque has new flood plain maps from FEMA that are more accurate than the existing maps. He explained the new maps noting that they were developed using LiDAR (Light Detection and Ranging) technology and that they remove 49 structures from the floodplain while adding five others. He said the new floodplain maps are required to be adopted by ordinance before August 10, 2021. In addition, the City is working with FEMA and IDNR to make necessary revisions to the City's floodplain development regulations. He said that the new ordinance repeals the former regulations and replaces them with an updated model ordinance. Commissioners discussed the request and agreed with the proposed text amendment. Recommendation By a vote of 6 to 0, the Zoning Advisory Commission recommends that the City Council approve the request. Service People Integrity Responsibility Innovation Teamwork The Honorable Mayor and City Council Members Page 2 A simple majority vote is needed for the City Council to approve the request. Respectfully submitted, htwl- ��4 Rebecca Kemp, Vice Chairperson Zoning Advisory Commission Attachments Service People Integrity Responsibility Innovation Teamwork Prepared by: Wally Wernimont, City Planner Address: City Hall, 50 W. 13th St Telephone: 563-589-4210 Return to: Adrienne Breitfelder, City Clerk Address: City Hall, 50 W. 13th St Telephone: 563-589-4121 ORDINANCE NO. 24-21 AN ORDINANCE AMENDING TITLE 16 OF THE CITY OF DUBUQUE CODE OF ORDINANCES, UNIFIED DEVELOPMENT CODE, BY REPEALING SECTION 6-4 FLOOD HAZARD OVERLAY DISTRICT AND ENACTING A NEW SECTION 6-4 FLOOD HAZARD OVERLAY DISTRICT TO COMPLY WITH NATIONAL FLOOD INSURANCE PROGRAM REQUIREMENTS. NOW, THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF DUBUQUE, IOWA: Section 1. That Title 16 of the City of Dubuque Code of Ordinances, Unified Development Code, be amended by repealing Section 6-4 and enacting a new Section 6-4 Flood Hazard Overlay Districts, as follows: 16-6-4: FLOOD HAZARD OVERLAY DISTRICT 16-6-4-1: DEFINITIONS: Unless specifically defined below or in Chapter 2 of this title, words or phrases used in Section 16-6-4 shall be interpreted so as to give them the meaning they have in common usage and to give Section 16-6-4 its most reasonable application. 1. APPURTENANT STRUCTURE - A structure which is on the same parcel of the property as the principal structure to be insured and the use of which is incidental to the use of the principal structure. 2. BASE FLOOD - The flood having one (1) percent chance of being equaled or exceeded in any given year. (Also commonly referred to as the 100-year flood"). 3. BASE FLOOD ELEVATION (BFE) - The elevation floodwaters would reach at a particular site during the occurrence of a base flood event. 4. BASEMENT - Any enclosed area of a building which has its floor or lowest level below ground level (subgrade) on all sides. Also see "lowest floor." 5. DEVELOPMENT - Any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation, drilling operations or storage of equipment or materials. "Development" does not include "minor projects" or "routine maintenance of existing buildings and facilities" as defined in this section. It also does not include gardening, plowing, and similar practices that do not involve filling or grading. 6. ENCLOSED AREA BELOW LOWEST FLOOR - The floor of the lowest enclosed area in a building when all the following criteria are met: A. The enclosed area is designed to flood to equalize hydrostatic pressure during flood events with walls or openings that satisfy the provisions of Section 16-6-4- 7(2)(D)(1) of Title 16, and B. The enclosed area is unfinished (not carpeted, drywalled, etc.) and used solely for low damage potential uses such as building access, parking or storage, and C. Machinery and service facilities (e.g., hot water heater, furnace, electrical service) contained in the enclosed area are located at least one (1) foot above the base flood elevation, and D. The enclosed area is not a "basement" as defined in this section. 7. EXISTING CONSTRUCTION -Any structure for which the "start of construction" commenced before the effective date of the first floodplain management regulations adopted by the community. 8. EXISTING FACTORY -BUILT HOME PARK OR SUBDIVISION - A factory -built home park or subdivision for which the construction of facilities for servicing the lots on which the factory -built homes are to be affixed (including at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed before the effective date of the first floodplain management regulations adopted by the community. 9. EXPANSION OF EXISTING FACTORY -BUILT HOME PARK OR SUBDIVISION - The preparation of additional sites by the construction of facilities for servicing the lots on which the factory -built homes are to be affixed (including at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads). 10. FACTORY -BUILT HOME - Any structure, designed for residential use which is wholly or in substantial part, made, fabricated, formed or assembled in manufacturing facilities for installation or assembly and installation, on a building site. For the purpose of Section 16-6-4 factory -built homes include mobile homes, manufactured homes, and modular homes; and also include "recreational vehicles" which are placed on a site for greater than 180 consecutive days and not fully licensed for and ready for highway use. 11. FACTORY -BUILT HOME PARK OR SUBDIVISION - A parcel or contiguous parcels of land divided into two or more factory -built home lots for sale or lease. 12. FIVE HUNDRED (500) YEAR FLOOD - A flood, the magnitude of which has a two - tenths (0.2) percent chance of being equaled or exceeded in any given year or which, on average, will be equaled or exceeded at least once every five hundred (500) years. 13. FLOOD - A general and temporary condition of partial or complete inundation of normally dry land areas resulting from the overflow of streams or rivers or from the unusual and rapid runoff of surface waters from any source. 14. FLOOD INSURANCE RATE MAP (FIRM) - The official map prepared as part of (but published separately from) the Flood Insurance Study which delineates both the flood hazard areas and the risk premium zones applicable to the community. 15. FLOOD INSURANCE STUDY (FIS) - A report published by FEMA for a community issued along with the community's Flood Insurance Rate Map(s). The study contains such background data as the base flood discharge and water surface elevations that were used to prepare the FIRM. 16. FLOODPLAIN - Any land area susceptible to being inundated by water as a result of a flood. 17. FLOODPLAIN MANAGEMENT - An overall program of corrective and preventive measures for reducing flood damages and promoting the wise use of floodplains, including but not limited to emergency preparedness plans, flood control works, floodproofing and floodplain management regulations. 18. FLOODPROOFING - Any combination of structural and nonstructural additions, changes, or adjustments to structures, including utility and sanitary facilities, which will reduce or eliminate flood damage to such structures. 19. FLOODWAY - The channel of a river or stream and those portions of the floodplains adjoining the channel, which are reasonably required to carry and discharge flood waters or flood flows so that confinement of flood flows to the floodway area will not cumulatively increase the water surface elevation of the base flood by more than one (1) foot. 20. FLOODWAY FRINGE - Those portions of the Special Flood Hazard Area outside the floodway. 21. HIGHEST ADJACENT GRADE - The highest natural elevation of the ground surface prior to construction next to the proposed walls of a structure. 22. HISTORIC STRUCTURE - Any structure that is: A. Listed individually in the National Register of Historic Places, maintained by the Department of Interior, or preliminarily determined by the Secretary of the Interior as meeting the requirements for individual listing of the National Register; B. Certified or preliminarily determined by the Secretary of the Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined by the Secretary to qualify as a registered historic district; C. Individually listed on a state inventory of historic places in states with historic preservation programs which have been approved by the Secretary of the Interior; or, D. Individually listed on a local inventory of historic places in communities with historic preservation programs that have been certified by either i) an approved state program as determined by the Secretary of the Interior or ii) directly by the Secretary of the Interior in states without approved programs. 23. LOWEST FLOOR - The floor of the lowest enclosed area in a building including a basement except when the criteria listed in the definition of Enclosed Area below Lowest Floor are met. 24. MAXIMUM DAMAGE POTENTIAL DEVELOPMENT - Hospitals and like institutions; buildings or building complexes containing documents, data, or instruments of great public value; buildings or building complexes containing materials dangerous to the public or fuel storage facilities; power installations needed in emergency or other buildings or building complexes similar in nature or use. 25. MINOR PROJECTS - Small development activities (except for filling, grading and excavating) valued at less than $500. 26. NEW CONSTRUCTION - (new buildings, factory -built home parks) - Those structures or development for which the start of construction commenced on or after the effective date of the first floodplain management regulations adopted by the community. 27. NEW FACTORY -BUILT HOME PARK OR SUBDIVISION - A factory -built home park or subdivision for which the construction of facilities for servicing the lots on which the factory -built homes are to be affixed (including at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed on or after the effective date of the first floodplain management regulations adopted by the community. 28. RECREATIONAL VEHICLE - A vehicle which is: A. Built on a single chassis; B. Four hundred (400) square feet or less when measured at the largest horizontal projection; C. Designed to be self-propelled or permanently towable by a light duty truck; and D. Designed primarily not for use as a permanent dwelling but as a temporary living quarters for recreational, camping, travel, or seasonal use. 29. ROUTINE MAINTENANCE OF EXISTING BUILDINGS AND FACILITIES - Repairs necessary to keep a structure in a safe and habitable condition that do not trigger a building permit, provided they are not associated with a general improvement of the structure or repair of a damaged structure. Such repairs include: A. Normal maintenance of structures such as re -roofing, replacing roofing tiles and replacing siding; B. Exterior and interior painting, papering, tiling, carpeting, cabinets, counter tops and similar finish work; C. Basement sealing; D. Repairing or replacing damaged or broken window panes; E. Repairing plumbing systems, electrical systems, heating or air conditioning systems and repairing wells or septic systems. 30. SPECIAL FLOOD HAZARD AREA (SFHA) - The land within a community subject to the "base flood". This land is identified on the community's Flood Insurance Rate Map as Zone A, Al -30, AE, AH, AO, AR, and/or A99. 31. START OF CONSTRUCTION - Includes substantial improvement, and means the date the development permit was issued, provided the actual start of construction, repair, reconstruction, rehabilitation, addition, placement, or other improvement, was within 180 days of the permit date. The actual start means either the first placement or permanent construction of a structure on a site, such as pouring of a slab or footings, the installation of pile, the construction of columns, or any work beyond the stage of excavation; or the placement of a factory -built home on a foundation. Permanent construction does not include land preparation, such as clearing, grading and filling; nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footings, piers, or foundations or the erection of temporary forms; nor does it include the installation on the property of accessory buildings such as garages or sheds not occupied as dwelling units or not part of the main structure. For a substantial improvement, the actual start of construction means the first alteration of any wall, ceiling, floor, or other structural part of the building, whether or not that alteration affects the external dimensions of the building. 32. STRUCTURE - Anything constructed or erected on the ground or attached to the ground, including, but not limited to, buildings, factories, sheds, cabins, factory -built homes, storage tanks, grain storage facilities and/or other similar uses. 33. SUBSTANTIAL DAMAGE - Damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damage condition would equal or exceed fifty (50) percent of the market value of the structure before the damage occurred. Volunteer labor and donated materials shall be included in the estimated cost of repair. 34. SUBSTANTIAL IMPROVEMENT - Any improvement to a structure which satisfies either of the following criteria: A. Any repair, reconstruction, or improvement of a structure, the cost of which equals or exceeds fifty (50) percent of the market value of the structure either (i) before the "start of construction" of the improvement, or (ii) if the structure has been "substantially damaged" and is being restored, before the damage occurred. The term does not, however, include any project for improvement of a structure to correct existing violations of state or local health, sanitary, or safety code specifications which have been identified by the local code enforcement official and which are the minimum necessary to assure safe living conditions. The term also does not include any alteration of an "historic structure", provided the alteration will not preclude the structure's designation as an "historic structure". B. Any addition which increases the original floor area of a building by 25 percent or more. All additions constructed after the effective date of the first floodplain management regulations adopted by the community shall be added to any proposed addition in determining whether the total increase in original floor space would exceed 25 percent. 35. VARIANCE - A grant of relief by a community from the terms of the floodplain management regulations. 36. VIOLATION - The failure of a structure or other development to be fully compliant with the community's floodplain management regulations. 16-6-4-2: STATUTORY AUTHORITY, FINDINGS OF FACT AND PURPOSE: 1. The Legislature of the State of Iowa has in Chapter 414, Code of Iowa, as amended, delegated the power to cities to enact zoning regulations to secure safety from flood and to promote health and the general welfare. 2. Findings of Fact A. The flood hazard areas of the City of Dubuque are subject to periodic inundation which can result in loss of life and property, health and safety hazards, disruption of commerce and governmental services, extraordinary public expenditures for flood protection and relief, and impairment of the tax base all of which adversely affect the public health, safety and general welfare of the community. B. These flood losses, hazards, and related adverse effects are caused by: (i) The occupancy of flood hazard areas by uses vulnerable to flood damages which create hazardous conditions as a result of being inadequately elevated or otherwise protected from flooding and (ii) the cumulative effect of obstructions on the floodplain causing increases in flood heights and velocities. C. Section 16-6-4 relies upon engineering methodology for analyzing flood hazards which is consistent with the standards established by the Department of Natural Resources. 3. Statement of Purpose It is the purpose of Section 16-6-4 to protect and preserve the rights, privileges and property of the City of Dubuque and its residents and to preserve and improve the peace, safety, health, welfare, and comfort and convenience of its residents by minimizing those flood losses described in Section 16-6-4-2(2)(A) of Title 16 Unified Development Code with provisions designed to: A. Reserve sufficient floodplain area for the conveyance of flood flows so that flood heights and velocities will not be increased substantially. B. Restrict or prohibit uses which are dangerous to health, safety or property in times of flood or which cause excessive increases in flood heights or velocities. C. Require that uses vulnerable to floods, including public facilities which serve such uses, be protected against flood damage at the time of initial construction or substantial improvement. D. Protect individuals from buying lands which may not be suited for intended purposes because of flood hazard. E. Assure that eligibility is maintained for property owners in the community to purchase flood insurance through the National Flood Insurance Program. 16-6-4-3: GENERAL PROVISIONS: 1. Lands to Which Unified Development Code Section 16-6-4 Apply The provisions of Section 16-6-4 shall apply to all lands within the jurisdiction of the City of Dubuque shown on the Official Floodplain Zoning Map as being within the boundaries of the Floodway, Floodway Fringe, and General Floodplain (Overlay) Districts, as established in Section 16-6-4-5. 2. Establishment of Official Floodplain Zoning Map The Flood Insurance Rate Map (FIRM) for Dubuque County and Incorporated Areas, City of Dubuque, Panels 19061 CO215F, 0217F, 0220F, 0236F, 0237F, 0238F, 0239F, 0241 F, 0330F, 0332F, 0335F, 0351 F, 0352F, 0354F, 0358F, 0365F, 0370F, dated August 10th, 2021, and Panels 19061 CO242F, 0243F, 0244F, 0356F, 0360F, dated August 19th, 2013 which were prepared as part of the Flood Insurance Study for Dubuque County, is (are) hereby adopted by reference and declared to be the Official Floodplain Zoning Map. The flood profiles and all explanatory material contained with the Flood Insurance Study are also declared to be a part of Section 16-6-4. 3. Rules for Interpretation of District Boundaries The boundaries of the zoning district areas shall be determined by scaling distances on the Official Floodplain Zoning Map. When an interpretation is needed as to the exact location of a boundary, the City Planner shall make the necessary interpretation. The Board of Adjustment shall hear and decide appeals when it is alleged that there is an error in any requirement, decision, or determination made by the City Planner in the enforcement or administration of Section 16-6-4. 4. Compliance No structure or land shall hereafter be used and no structure shall be located, extended, converted or structurally altered without full compliance with the terms of Section 16-6-4 and other applicable regulations which apply to uses within the jurisdiction of Section 16-6-4. 5. Abrogation and Greater Restrictions It is not intended by Section 16-6-4 to repeal, abrogate or impair any existing easements, covenants, or deed restrictions. However, where Section 16-6-4 imposes greater restrictions, the provision of Section 16-6-4 shall prevail. All other ordinances inconsistent with Section 16-6-4 are hereby repealed to the extent of the inconsistency only. 6. Interpretation In their interpretation and application, the provisions of Section 16-6-4 shall be held to be minimum requirements and shall be liberally construed in favor of the governing body and shall not be deemed a limitation or repeal of any other powers granted by State statutes. 7. Warning and Disclaimer of Liability The standards required by Section 16-6-4 are considered reasonable for regulatory purposes. Section 16-6-4 does not imply that areas outside the designated Floodplain (Overlay) District areas will be free from flooding or flood damages. Section 16-6-4 shall not create liability on the part of the City of Dubuque or any officer or employee thereof for any flood damages that result from reliance on Section 16-6-4 or any administrative decision lawfully made there under. 8. Severability If any section, clause, provision or portion of Section 16-6-4 is adjudged unconstitutional or invalid by a court of competent jurisdiction, the remainder of Section 16-6-4 shall not be affected thereby. 16-6-4-4: Administration: 1. Appointment, Duties and Responsibilities of Local Official A. The City Planner is hereby appointed to implement and administer the provisions of Section 16-6-4 and will herein be referred to as the Administrator. B. Duties and responsibilities of the Administrator shall include, but not necessarily be limited to the following: 1) Review all floodplain development permit applications to assure that the provisions of Section 16-6-4 will be satisfied. 2) Review floodplain development applications to assure that all necessary permits have been obtained from federal, state and local governmental agencies including approval when required from the Department of Natural Resources for floodplain construction. 3) Record and maintain a record of (i) the elevation (in relation to North American Vertical Datum 1988) of the lowest floor (including basement) of all new or substantially improved structures or (ii) the elevation to which new or substantially improved structures have been floodproofed. 4) Notify adjacent communities/counties and the Department of Natural Resources prior to any proposed alteration or relocation of a watercourse and submit evidence of such notifications to the Federal Emergency Management Agency. 5) Keep a record of all permits, appeals and such other transactions and correspondence pertaining to the administration of Section 16-6-4. 6) Submit to the Federal Insurance Administrator an annual report concerning the community's participation, utilizing the annual report form supplied by the Federal Insurance Administrator. 7) Notify the Federal Insurance Administrator of any annexations or modifications to the community's boundaries. 8) Review subdivision proposals to ensure such proposals are consistent with the purpose of Section 16-6-4 and advise the Board of Adjustment of potential conflict. 9) Maintain the accuracy of the community's Flood Insurance Rate Maps when; a. Development placed within the Floodway (Overlay) District results in any of the following: (i) An increase in the Base Flood Elevations, or (ii) Alteration to the floodway boundary b. Development placed in Zones A, AE, AH, and Al-30 that does not include a designated floodway that will cause a rise of more than one foot in the base elevation; or c. Development relocates or alters the channel. Within 6 months of the completion of the development, the applicant shall submit to FEMA all scientific and technical data necessary for a Letter of Map Revision. 10)Perform site inspections to ensure compliance with the standards of Section 16-6-4. 11)Forward all requests for Variances to the Board of Adjustment for consideration. Ensure all requests include the information ordinarily submitted with applications as well as any additional information deemed necessary to the Board of Adjustment. 2. Floodplain Development Permit A. Permit Required - A Floodplain Development Permit issued by the Administrator shall be secured prior to any floodplain development (any man-made change to improved and unimproved real estate, including but not limited to buildings or other structures, mining, filling, grading, paving, storage of materials or equipment, excavation or drilling operations), including the placement of factory - built homes. B. Application for Permit - Application shall be made on forms furnished by the Administrator and shall include the following: 1) Description of the work to be covered by the permit for which application is to be made. 2) Description of the land on which the proposed work is to be done (i.e., lot, block, track, street address or similar description) that will readily identify and locate the work to be done. 3) Location and dimensions of all structures and additions 4) Indication of the use or occupancy for which the proposed work is intended. 5) Elevation of the base flood. 6) Elevation (in relation to North American Vertical Datum 1988) of the lowest floor (including basement) of structures or of the level to which a structure is to be floodproofed. 7) For structures being improved or rebuilt, the estimated cost of improvements and market value of the structure prior to the improvements. 8) Such other information as the Administrator deems reasonably necessary (e.g., drawings or a site plan) for the purpose of Section 16-6-4. C. Action on Permit Application - The Administrator shall, within a reasonable time, make a determination as to whether the proposed floodplain development meets the applicable standards of Section 16-6-4 and shall approve or disapprove the application. For disapprovals, the applicant shall be informed, in writing, of the specific reasons therefore. The Administrator shall not issue permits for variances except as directed by the Board of Adjustment. D. Construction and Use to be as Provided in Application and Plans - Floodplain Development Permits based on the basis of approved plans and applications authorize only the use, arrangement, and construction set forth in such approved plans and applications and no other use, arrangement or construction. Any use, arrangement, or construction at variance with that authorized shall be deemed a violation of Section 16-6-4. The applicant shall be required to submit certification by a professional engineer or land surveyor, as appropriate, registered in the State of Iowa, that the finished fill, structure floor elevations, floodproofing, or other flood protection measures were accomplished in compliance with the provisions of Section 16-6-4, prior to the use or occupancy of any structure. 16-6-4-5: ESTABLISHMENT OF FLOODPLAIN (OVERLAY) DISTRICTS: The floodplain areas within the jurisdiction of Section 16-6-4 are hereby divided into the following districts: 1. Floodway (Overlay) District (FW) -those areas identified as Floodway on the Official Floodplain Zoning Map; 2. Floodway Fringe (Overlay) District (FF) - those areas identified as Zone AE on the Official Floodplain Zoning Map but excluding those areas identified as Floodway; 3. General Floodplain (Overlay) District (GF) - those areas identified as Zone A on the Official Floodplain Zoning Map. The boundaries shall be as shown on the Official Floodplain Zoning Map. Within these districts, all uses not allowed as Permitted Uses are prohibited unless a variance to the terms of Section 16-6-4 is granted after due consideration by the Board of Adjustment. 16-6-4-6: FLOODWAY (OVERLAY) DISTRICT (FW): 1. Permitted Uses All development within the Floodway District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet applicable performance standards of the Floodway District. 2. Performance Standards All Floodway District uses allowed as a Permitted Use shall meet the following standards. A. No development shall be permitted in the Floodway District that would result in any increase in the base flood elevation. Consideration of the effects of any development on flood levels shall be based upon the assumption that an equal degree of development would be allowed for similarly situated lands. B. All development within the Floodway District shall: 1) Be consistent with the need to minimize flood damage. 2) Use construction methods and practices that will minimize flood damage. 3) Use construction materials and utility equipment that are resistant to flood damage. C. No development shall affect the capacity or conveyance of the channel or floodway of any tributary to the main stream, drainage ditch or any other drainage facility or system. D. Structures, buildings, recreational vehicles, and sanitary and utility systems, if permitted, shall meet the applicable performance standards of the Floodway Fringe District and shall be constructed or aligned to present the minimum possible resistance to flood flows. E. Structures, if permitted, shall have a low flood damage potential and shall not be for human habitation. F. Storage of materials or equipment that are buoyant, flammable, explosive or injurious to human, animal or plant life is prohibited. Storage of other material may be allowed if readily removable from the Floodway District within the time available after flood warning. G. Watercourse alterations or relocations (channel changes and modifications) must be designed to maintain the flood carrying capacity within the altered or relocated portion. In addition, such alterations or relocations must be approved by the Department of Natural Resources. H. Any fill allowed in the floodway must be shown to have some beneficial purpose and shall be limited to the minimum amount necessary. Pipeline river or stream crossings shall be buried in the streambed and banks or otherwise sufficiently protected to prevent rupture due to channel degradation and meandering or due to the action of flood flows. 16-6-4-7: FLOODWAY FRINGE (OVERLAY) DISTRICT FF: 1. Permitted Uses All development within the Floodway Fringe District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet applicable performance standards of the Floodway Fringe District. 2. Performance Standards All development must be consistent with the need to minimize flood damage and meet the following applicable performance standards. Until a regulatory floodway is designated, no development may increase the Base Flood Elevation more than one (1) foot. The applicant will be responsible for providing the Department of Natural Resources with sufficient technical information to make such determination. A. All development shall: 1) Be designed and adequately anchored to prevent flotation, collapse or lateral movement. 2) Use construction methods and practices that will minimize flood damage. 3) Use construction materials and utility equipment that are resistant to flood damage. B. Residential structures - All new or substantially improved residential structures shall have the lowest floor, including basement, elevated a minimum of one (1) foot above the base flood elevation. Construction shall be upon compacted fill which shall, at all points, be no lower than 1.0 ft. above the base flood elevation and extend at such elevation at least 18 feet beyond the limits of any structure erected thereon. Alternate methods of elevating (such as piers or extended foundations) may be allowed where existing topography, street grades, or other factors preclude elevating by fill. In such cases, the methods used must be adequate to support the structure as well as withstand the various forces and hazards associated with flooding. All new residential structures located in areas that would become isolated due to flooding of surrounding ground shall be provided with a means of access that will be passable by wheeled vehicles during the base flood. However, this criterion shall not apply where the Administrator determines there is sufficient flood warning time for the protection of life and property. When estimating flood warning time, consideration shall be given to the criteria listed in 567-75.2(3), Iowa Administrative Code. C. Non-residential structures - All new or substantially improved non-residential structures shall have the lowest floor (including basement) elevated a minimum of one (1) foot above the base flood elevation, or together with attendant utility and sanitary systems, be floodproofed to such a level. When floodproofing is utilized, a professional engineer registered in the State of Iowa shall certify that the floodproofing methods used are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the base flood; and that the structure, below the base flood elevation is watertight with walls substantially impermeable to the passage of water. A record of the certification indicating the specific elevation (in relation to North American Vertical Datum 1988) to which any structures are floodproofed shall be maintained by the Administrator. D. All new and substantially improved structures 1) Fully enclosed areas below the "lowest floor" (not including basements) that are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or meet or exceed the following minimum criteria: a. A minimum of two (2) openings, with positioning on at least two (2) walls, having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. b. The bottom of all openings shall be no higher than one foot above grade. c. Openings may be equipped with screens, louvers, valves, or other coverings or devices provided they permit the automatic entry and exit of floodwaters. Such areas shall be used solely for parking of vehicles, building access and low damage potential storage. 2) New and substantially improved structures must be designed (or modified) and adequately anchored to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy. 3) New and substantially improved structures shall be constructed with electrical, heating, ventilation, plumbing, air conditioning equipment and other service facilities (including ductwork) elevated to a minimum of one (1) foot above the base flood elevation. E. Factory -built homes 1) All new and substantially improved factory -built homes, including those placed in existing factory -built home parks or subdivisions, shall be elevated on a permanent foundation such that the lowest floor of the structure is a minimum of one (1) foot above the base flood elevation. 2) All new and substantially improved factory -built homes, including those placed in existing factory -built home parks or subdivisions, shall be anchored to resist flotation, collapse, or lateral movement. Anchorage systems may include, but are not limited to, use of over -the -top or frame ties to ground anchors as required by the State Building Code. F. Utility and Sanitary Systems 1) On -site wastewater disposal and water supply systems shall be located or designed to avoid impairment to the system or contamination from the system during flooding. 2) All new and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the system as well as the discharge of effluent into flood waters. Wastewater treatment facilities (other than on -site systems) shall be provided with a level of flood protection equal to or greater than one (1) foot above the base flood elevation. 3) New or replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system. Water supply treatment facilities (other than on -site systems) shall be provided with a level of protection equal to or greater than one (1) foot above the base flood elevation. 4) Utilities such as gas or electrical systems shall be located and constructed to minimize or eliminate flood damage to the system and the risk associated with such flood damaged or impaired systems. G. Storage of materials and equipment that are flammable, explosive or injurious to human, animal or plant life is prohibited unless elevated a minimum of one (1) foot above the base flood elevation. Other material and equipment must either be similarly elevated or (i) not be subject to major flood damage and be anchored to prevent movement due to flood waters or (ii) be readily removable from the area within the time available after flood warning. H. Flood control structural works such as levees, flood walls, etc. shall provide, at a minimum, protection from the base flood with a minimum of 3 ft. of design freeboard and shall provide for adequate interior drainage. In addition, the Department of Natural Resources shall approve structural flood control works. Watercourse alterations or relocations must be designed to maintain the flood carrying capacity within the altered or relocated portion. In addition, the Department of Natural Resources must approve such alterations or relocations. J. Subdivisions (including factory -built home parks and subdivisions) shall be consistent with the need to minimize flood damages and shall have adequate drainage provided to reduce exposure to flood damage. Development associated with subdivision proposals (including the installation of public utilities) shall meet the applicable performance standards of Section 16-6-4. Subdivision proposals intended for residential use shall provide all lots with a means of access which will be passable by wheeled vehicles during the base flood. Proposals for subdivisions greater than five (5) acres or fifty (50) lots (whichever is less) shall include base flood elevation data for those areas located within the Floodway Fringe (Overlay) District. K. Accessory Structures to Residential Uses 1) Detached garages, sheds, and similar structures that are incidental to a residential use are exempt from the base flood elevation requirements where the following criteria are satisfied: a. The structure shall be designed to have low flood damage potential. Its size shall not exceed 600 sq. ft. in size. Those portions of the structure located less than 1 foot above the base flood elevation must be constructed of flood -resistant materials. b. The structure shall be used solely for low flood damage potential purposes such as vehicle parking and limited storage. The structure shall not be used for human habitation. c. The structure shall be constructed and placed on the building site so as to offer minimum resistance to the flow of floodwaters. d. The structure shall be firmly anchored to prevent flotation, collapse, and lateral movement which may result in damage to other structures. e. The structure's service facilities such as electrical and heating equipment shall be elevated or floodproofed to at least one foot above the base flood elevation. f. The structure's walls shall include openings that satisfy the provisions of Section 16-6-4-7(2)(D)(1) of Title 16 Unified Development Code. 2) Exemption from the base flood elevation requirements for such a structure may result in increased premium rates for flood insurance coverage of the structure and its contents. L. Recreational Vehicles 1) Recreational vehicles are exempt from the requirements of Section 16-6-4- 7(2)(E) of Title 16 Unified Development Code regarding anchoring and elevation of factory -built homes when the following criteria are satisfied: a. The recreational vehicle shall be located on the site for less than 180 consecutive days, and, b. The recreational vehicle must be fully licensed and ready for highway use. A recreational vehicle is ready for highway use if it is on its wheels or jacking system and is attached to the site only by quick disconnect type utilities and security devices and has no permanently attached additions. 2) Recreational vehicles that are located on the site for more than 180 consecutive days or are not ready for highway use must satisfy requirements of Section 16-6-4-7(2)(E) of Title 16 Unified Development Code regarding anchoring and elevation of factory -built homes. M. Pipeline river and stream crossings shall be buried in the streambed and banks, or otherwise sufficiently protected to prevent rupture due to channel degradation and meandering. N. Maximum Damage Potential Development - All new or substantially improved maximum damage potential development shall have the lowest floor (including basement) elevated a minimum of one (1) foot above the elevation of the 500- year flood, or together with attendant utility and sanitary systems, be floodproofed to such a level. When floodproofing is utilized, a professional engineer registered in the State of Iowa shall certify that the floodproofing methods used are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the 0.2% annual chance flood; and that the structure, below the 0.2% annual chance flood elevation is watertight with walls substantially impermeable to the passage of water. A record of the certification indicating the specific elevation (in relation to North American Vertical Datum 1988) to which any structures are floodproofed shall be maintained by the Administrator. Where 0.2% chance flood elevation data has not been provided in the Flood Insurance Study, the Iowa Department of Natural Resources shall be contacted to compute such data. The applicant will be responsible for providing the Department of Natural Resources with sufficient technical information to make such determinations. 16-6-4-8: GENERAL FLOODPLAIN (OVERLAY) DISTRICT (GF): 1. Permitted Uses A. All development within the General Floodplain District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet the applicable performance standards of the General Floodplain District. B. Any development which involves placement of structures, factory -built homes, fill or other obstructions, storage of materials or equipment, excavation or alteration of a watercourse shall be reviewed by the Department of Natural Resources to determine (i) whether the land involved is either wholly or partly within the floodway or floodway fringe and (ii) the base flood elevation. The applicant shall be responsible for providing the Department of Natural Resources with sufficient technical information to make the determination. C. Review by the Iowa Department of Natural Resources is not required for the proposed construction of new or replacement bridges or culverts where: 1) The bridge or culvert is located on a stream that drains less than two (2) square miles, and 2) The bridge or culvert is not associated with a channel modification that constitutes a channel change as specified in 567-71.2(2), Iowa Administrative Code. 2. Performance Standards A. All development, or portions thereof, to be located in the floodway as determined by the Department of Natural Resources shall meet the applicable provisions and standards of the Floodway (Overlay) District Section 16-6-4-6. B. All development, or portions thereof, to be located in the floodway fringe as determined by the Department of Natural Resources shall meet the applicable provisions and standards of the Floodway Fringe (Overlay) District Section 16-6- 4-7. 16-6-4-9: APPOINTMENT AND DUTIES OF BOARD OF ADJUSTMENT: Appointment and Duties of Board of Adjustment - A Board of Adjustment is hereby established which shall hear and decide (i) appeals and (ii) requests for variances to the provisions of Section 16-6-4, and shall take any other action which is required of the Board. 2. Appeals - Where it is alleged there is any error in any order, requirement, decision, or determination made by an administrative official in the enforcement of Section 16- 6-4, the aggrieved party may appeal such action. The notice of appeal shall be filed with the Board of Adjustment and with the official from whom the appeal is taken and shall set forth the specific reason for the appeal. The official from whom the appeal is taken shall transmit to the Board of Adjustment all the documents constituting the record upon which the action appealed from was taken. 3. Variance - The Board of Adjustment may authorize upon request in specific cases such variances from the terms of Section 16-6-4 that will not be contrary to the public interest where, owing to special conditions, a literal enforcement of the provisions of Section 16-6-4 will result in unnecessary hardship. Variances granted must meet the following applicable standards: A. Variances shall only be granted upon: (i) a showing of good and sufficient cause, (ii) a determination that failure to grant the variance would result in exceptional hardship to the applicant, and (iii) a determination that the granting of the variance will not result in increased flood heights, additional threats to public safety, extraordinary public expense, create nuisances, cause fraud on or victimization of the public or conflict with existing local codes or ordinances. B. Variances shall not be issued within any designated floodway if any increase in flood levels during the base flood would result. Consideration of the effects of any development on flood levels shall be based upon the assumption that an equal degree of development would be allowed for similarly situated lands. C. Variances shall only be granted upon a determination that the variance is the minimum necessary, considering the flood hazard, to afford relief. D. In cases where the variance involves a lower level of flood protection for structures than what is ordinarily required by Section 16-6-4, the applicant shall be notified in writing over the signature of the Administrator that: (i) the issuance of a variance will result in increased premium rates for flood insurance up to amounts as high as $25 for $100 of insurance coverage and (ii) such construction increases risks to life and property. E. All variances granted shall have the concurrence or approval of the Department of Natural Resources. 4. Hearings and Decisions of the Board of Adjustment A. Hearings. Upon the filing with the Board of Adjustment of an Appeal or a request for a Variance, the Board shall hold a public hearing. The Board shall fix a reasonable time for the hearing and give public notice thereof, as well as due notice to parties in interest. At the hearing, any party may appear in person or by agent or attorney and present written or oral evidence. The Board may require the appellant or applicant to provide such information as is reasonably deemed necessary and may request the technical assistance and/or evaluation of a professional engineer or other expert person or agency, including the Department of Natural Resources. B. Decisions. The Board shall arrive at a decision on an Appeal or Variance within a reasonable time. In passing upon an Appeal, the Board may, so long as such action is in conformity with the provisions of Section 16-6-4, reverse or affirm, wholly or in part, or modify the order, requirement, decision, or determination appealed from, and it shall make its decision, in writing, setting forth the findings of fact and the reasons for its decision. In granting a Variance, the Board shall consider such factors as contained in this section and all other relevant sections of Section 16-6-4 and may prescribe such conditions as contained in Section 16- 6-4-9(B)(2). 1) Factors Upon Which the Decision of the Board of Adjustment Shall be Based. In passing upon applications for Variances, the Board shall consider all relevant factors specified in other sections of Section 16-6-4 and: a. The danger to life and property due to increased flood heights or velocities caused by encroachments. b. The danger that materials may be swept on to other land or downstream to the injury of others. c. The proposed water supply and sanitation systems and the ability of these systems to prevent disease, contamination and unsanitary conditions. d. The susceptibility of the proposed facility and its contents to flood damage and the effect of such damage on the individual owner. e. The importance of the services provided by the proposed facility to the City. f. The requirements of the facility for a floodplain location. g. The availability of alternative locations not subject to flooding for the proposed use. h. The compatibility of the proposed use with existing development and development anticipated in the foreseeable future. i. The relationship of the proposed use to the comprehensive plan and floodplain management program for the area. j. The safety of access to the property in times of flood for ordinary and emergency vehicles. k. The expected heights, velocity, duration, rate of rise and sediment transport of the flood water expected at the site. I. The cost of providing governmental services during and after flood conditions, including maintenance and repair of public utilities (sewer, gas, electrical and water systems), facilities, streets and bridges. m. Such other factors which are relevant to the purpose of Section 16-6-4. 2) Conditions Attached to Variances - Upon consideration of the factors listed above, the Board of Adjustment may attach such conditions to the granting of variances as it deems necessary to further the purpose of Section 16-6-4. Such conditions may include, but not necessarily be limited to: a. Modification of waste disposal and water supply facilities. b. Limitation of periods of use and operation. c. Imposition of operational controls, sureties, and deed restrictions. d. Requirements for construction of channel modifications, dikes, levees, and other protective measures, provided such are approved by the Department of Natural Resources and are deemed the only practical alternative to achieving the purpose of Section 16-6-4. e. Floodproofing measures shall be designed consistent with the flood protection elevation for the particular area, flood velocities, duration, rate of rise, hydrostatic and hydrodynamic forces, and other factors associated with the regulatory flood. The Board of Adjustment shall require that the applicant submit a plan or document certified by a registered professional engineer that the floodproofing measures are consistent with the regulatory flood protection elevation and associated flood factors for the particular area. 5. Appeals to the Court - Any person or persons, jointly or severally, aggrieved by any decision of the Board of Adjustment may present to a court of record a petition, duly verified, setting forth that such decision is illegal, in whole or in part, specifying the grounds of the illegality. Such petition shall be presented to the court within thirty days after the filing of the decision in the office of the Board. 16-6-4-10: NONCONFORMING USES: 1. A structure or the use of a structure or premises which was lawful before the passage or amendment of Section 16-6-4, but which is not in conformity with the provisions of Section 16-6-4, may be continued subject to the following conditions: A. If such use is discontinued for six (6) consecutive months, any future use of the building premises shall conform to Section 16-6-4. B. Uses or adjuncts thereof that are or become nuisances shall not be entitled to continue as nonconforming uses. C. If any nonconforming use or structure is destroyed by any means, including flood, it shall not be reconstructed if the cost is more than fifty (50) percent of the market value of the structure before the damage occurred, unless it is reconstructed in conformity with the provisions of Section 16-6-4. This limitation does not include the cost of any alteration to comply with existing state or local health, sanitary, building or safety codes or regulations or the cost of any alteration of a structure listed on the National Register of Historic Places, provided that the alteration shall not preclude its continued designation. 2. Except as provided in Section 16-6-4-10(1)(B), any use which has been permitted as a Variance shall be considered a conforming use. 16-6-4-11: PENALTIES FOR VIOLATION: Violations of the provisions of Unified Development Code Section 16-6-4 or failure to comply with any of the requirements (including violations of conditions and safeguards established in connection with grants of Variances) shall constitute a misdemeanor. Any person who violates Section 16-6-4 or fails to comply with any of its requirements shall upon conviction thereof be fined not more than $500.00 (FIVE HUNDRED DOLLARS) or imprisoned for not more than 30 (THIRTY) days. Each day such violation continues shall be considered a separate offense. Nothing herein contained prevent the City of Dubuque from taking such other lawful action as is necessary to prevent or remedy violation. 16-6-4-12: AMENDMENTS: The regulations and standards set forth in Unified Development Code Section 16-6-4 may from time to time be amended, supplemented, changed, or repealed. No amendment, supplement, change, or modification shall be undertaken without prior approval of the Department of Natural Resources. Section 2. The ordinance shall take effect on August 10, 2021. Passed, approved and adopted this 21St day of June, 2021. nny C. prank, Mayor Pro Tern Attest: a4x" /'7- AivW66,-,? Adrienne N. Breitfelder, COClerk FLOOD INSURANCE STUDY FRERAI- EMEROENCY MANAGEMENT AGENCY VOLUME 1 OF 1 DUBUQUE COUNTY, IOWA AND INCORPORATED AREAS COMMUNITY NAME COMMUNITY NAME CITY OF ASBURY 190053 CITY OF FARLEY* 190578 CITY OF BALLTOWN* 190449 CITY OF GRAF 190370 CITY OF BANKSTON* 190107 CITY OF HOLY CROSS* 190055 CITY OF BERNARD* 190028 CITY OF LUXEMBURG 190040 CITY OF CASCADE 190117 CITY OF NEW VIENNA 190121 CITY OF CENTRALIA* 190500 CITY OF PEOSTA 190079 CITY OF DUBUQUE 195180 CITY OF RICKARDSVILLE 190526 DUBUQUE COUNTY (UNINCORPORATED AREAS) 190534 CITY OF SAGEVILLE 190122 CITY OF DURANGO 190119 CITY OF SHERRILL* 190306 CITY OF DYERSVILLE 190120 CITY OF WORTHINGTON 190123 CITY OF EPWORTH 190576 CITY OF ZWINGLE 190371 *No Special Flood Hazard Areas Identified neAR REVISED: August 10, 2021 FLOOD INSURANCE STUDY NUMBER 19061 CVOOOC Version Number 2.4.3.0 TABLE OF CONTENTS Volume 1 Paqe SECTION 1.0 — INTRODUCTION 1 1.1 The National Flood Insurance Program 1 1.2 Purpose of this Flood Insurance Study Report 2 1.3 Jurisdictions Included in the Flood Insurance Study Project 2 1.4 Considerations for using this Flood Insurance Study Report 6 SECTION 2.0 — FLOODPLAIN MANAGEMENT APPLICATIONS 15 2.1 Floodplain Boundaries 15 2.2 Floodways 16 2.3 Base Flood Elevations 22 2.4 Non -Encroachment Zones 22 2.5 Coastal Flood Hazard Areas 22 2.5.1 Water Elevations and the Effects of Waves 22 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 22 2.5.3 Coastal High Hazard Areas 22 2.5.4 Limit of Moderate Wave Action 23 SECTION 3.0 — INSURANCE APPLICATIONS 23 3.1 National Flood Insurance Program Insurance Zones 23 3.2 Coastal Barrier Resources System 24 SECTION 4.0 — AREA STUDIED 25 4.1 Basin Description 25 4.2 Principal Flood Problems 25 4.3 Non -Levee Flood Protection Measures 26 4.4 Levees 26 SECTION 5.0 — ENGINEERING METHODS 29 5.1 Hydrologic Analyses 29 5.2 Hydraulic Analyses 37 5.3 Coastal Analyses 42 5.3.1 Total Stillwater Elevations 42 5.3.2 Waves 43 5.3.3 Coastal Erosion 43 5.3.4 Wave Hazard Analyses 43 5.4 Alluvial Fan Analyses 43 TABLE OF CONTENTS (continued) Volume 1 (continued) SECTION 6.0 — MAPPING METHODS 43 6.1 Vertical and Horizontal Control 43 6.2 Base Map 44 6.3 Floodplain and Floodway Delineation 45 6.4 Coastal Flood Hazard Mapping 70 6.5 FIRM Revisions 70 6.5.1 Letters of Map Amendment 70 6.5.2 Letters of Map Revision Based on Fill 70 6.5.3 Letters of Map Revision 71 6.5.4 Physical Map Revisions 71 6.5.5 Contracted Restudies 71 6.5.6 Community Map History 72 SECTION 7.0 — CONTRACTED STUDIES AND COMMUNITY COORDINATION 74 7.1 Contracted Studies 74 7.2 Community Meetings 76 SECTION 8.0 — ADDITIONAL INFORMATION 78 SECTION 9.0 — BIBLIOGRAPHY AND REFERENCES 80 Figures Paqe Figure 1: FIRM Panel Index 8 Figure 2: FIRM Notes to Users 9 Figure 3: Map Legend for FIRM 12 Figure 4: Floodway Schematic 17 Figure 5: Wave Runup Transect Schematic 22 Figure 6: Coastal Transect Schematic 23 Figure 7: Frequency Discharge -Drainage Area Curves 35 Figure 8: 1 % Annual Chance Total Stillwater Elevations for Coastal Areas 42 Figure 9: Transect Location Map 43 Tables Paqe Table 1: Listing of NFIP Jurisdictions 3 Table 2: Flooding Sources Included in this FIS Report 18 Table 3: Flood Zone Designations by Community 24 Table 4: Coastal Barrier Resources System Information 24 Table 5: Basin Characteristics 25 Table 6: Principal Flood Problems 25 Table 7: Historic Flooding Elevations 26 Table 8: Non -Levee Flood Protection Measures 26 Table 9: Levees 28 TABLE OF CONTENTS (continued) Volume 1 (continued) Tables (continued) Table 10: Summary of Discharges 30 Table 11: Summary of Non -Coastal Stillwater Elevations 36 Table 12: Stream Gage Information used to Determine Discharges 36 Table 13: Summary of Hydrologic and Hydraulic Analyses 38 Table 14: Roughness Coefficients 42 Table 15: Summary of Coastal Analyses 42 Table 16: Tide Gage Analysis Specifics 43 Table 17: Coastal Transect Parameters 43 Table 18: Summary of Alluvial Fan Analyses 43 Table 19: Results of Alluvial Fan Analyses 43 Table 20: Countywide Vertical Datum Conversion 44 Table 21: Stream -by -Stream Vertical Datum Conversion 44 Table 22: Base Map Sources 44 Table 23: Summary of Topographic Elevation Data used in Mapping 45 Table 24: Floodway Data 46 Table 25: Flood Hazard and Non -Encroachment Data for Selected Streams 70 Table 26: Summary of Coastal Transect Mapping Considerations 70 Table 27: Incorporated Letters of Map Change 71 Table 28: Community Map History 73 Table 29: Summary of Contracted Studies Included in this FIS Report 74 Table 30: Community Meetings 77 Table 31: Map Repositories 78 Table 32: Additional Information 80 Table 33: Bibliography and References 81 Exhibits Flood Profiles Panel Bear Creek 01 P Bloody Run 02 P Catfish Creek 03-06 P Cloie Branch 07-09 P Couler Valley Creek 10-11 P Couler Valley Creek Tributary 12 P Durion Creek 13-14 P Granger Creek 15-16 P Hewitt Creek 17-18 P Hewitt Creek Tributary 19 P Little Maquoketa River 20-25 P Middle Fork Catfish Creek 26-33 P Mississippi River 34-35 P North Fork Catfish Creek 36-37 P(a) North Fork Little Maquoketa River 38 P North Fork Little Maquoketa River Tributary 39-40 P North Fork Maquoketa River 41-45 P North Fork Maquoketa River Tributary 46-47 P Sherill Creek 48-49 P South Fork Catfish Creek 50-53 P Union Park Hollow 54-55 P Flood Insurance Rate Map (FIRM) Published Separately iv FLOOD INSURANCE STUDY REPORT DUBUQUE COUNTY, IOWA SECTION 1.0 — INTRODUCTION 1.1 The National Flood Insurance Program The National Flood Insurance Program (NFIP) is a voluntary Federal program that enables property owners in participating communities to purchase insurance protection against losses from flooding. This insurance is designed to provide an insurance alternative to disaster assistance to meet the escalating costs of repairing damage to buildings and their contents caused by floods. For decades, the national response to flood disasters was generally limited to constructing flood - control works such as dams, levees, sea-walls, and the like, and providing disaster relief to flood victims. This approach did not reduce losses nor did it discourage unwise development. In some instances, it may have actually encouraged additional development. To compound the problem, the public generally could not buy flood coverage from insurance companies, and building techniques to reduce flood damage were often overlooked. In the face of mounting flood losses and escalating costs of disaster relief to the general taxpayers, the U.S. Congress created the NFIP. The intent was to reduce future flood damage through community floodplain management ordinances, and provide protection for property owners against potential losses through an insurance mechanism that requires a premium to be paid for the protection. The U.S. Congress established the NFIP on August 1, 1968, with the passage of the National Flood Insurance Act of 1968. The NFIP was broadened and modified with the passage of the Flood Disaster Protection Act of 1973 and other legislative measures. It was further modified by the National Flood Insurance Reform Act of 1994 and the Flood Insurance Reform Act of 2004. The NFIP is administered by the Federal Emergency Management Agency (FEMA), which is a component of the Department of Homeland Security (DHS). Participation in the NFIP is based on an agreement between local communities and the Federal Government. If a community adopts and enforces floodplain management regulations to reduce future flood risks to new construction and substantially improved structures in Special Flood Hazard Areas (SFHAs), the Federal Government will make flood insurance available within the community as a financial protection against flood losses. The community's floodplain management regulations must meet or exceed criteria established in accordance with Title 44 Code of Federal Regulations (CFR) Part 60.3, Criteria for land Management and Use. SFHAs are delineated on the community's Flood Insurance Rate Maps (FIRMs). Under the NFIP, buildings that were built before the flood hazard was identified on the community's FIRMS are generally referred to as "Pre -FIRM" buildings. When the NFIP was created, the U.S. Congress recognized that insurance for Pre -FIRM buildings would be prohibitively expensive if the premiums were not subsidized by the Federal Government. Congress also recognized that most of these floodprone buildings were built by individuals who did not have sufficient knowledge of the flood hazard to make informed decisions. The NFIP requires that full actuarial rates reflecting the complete flood risk be charged on all buildings constructed or substantially improved on or after the effective date of the initial FIRM for the community or after December 31, 1974, whichever is later. These buildings are generally referred to as "Post -FIRM" buildings. 1.2 Purpose of this Flood Insurance Study Report This Flood Insurance Study (FIS) report revises and updates information on the existence and severity of flood hazards for the study area. The studies described in this report developed flood hazard data that will be used to establish actuarial flood insurance rates and to assist communities in efforts to implement sound floodplain management. In some states or communities, floodplain management criteria or regulations may exist that are more restrictive than the minimum Federal requirements. Contact your State NFIP Coordinator to ensure that any higher State standards are included in the community's regulations. 1.3 Jurisdictions Included in the Flood Insurance Study Project This FIS Report covers the entire geographic area of Dubuque County, Iowa and Incorporated Areas. The jurisdictions that are included in this project area, along with the Community Identification Number (CID) for each community and the 8-digit Hydrologic Unit Codes (HUC-8) sub -basins affecting each, are shown in Table 1. The Flood Insurance Rate Map (FIRM) panel numbers that affect each community are listed. If the flood hazard data for the community is not included in this FIS Report, the location of that data is identified. The location of flood hazard data for participating communities in multiple jurisdictions is also indicated in the table. Jurisdictions that have no identified SFHAs as of the effective date of this study are indicated in the table. Changed conditions in these communities (such as urbanization or annexation) or the availability of new scientific or technical data about flood hazards could make it necessary to determine SFHAs in these jurisdictions in the future. 2 Table 1: Listing of NFIP Jurisdictions If Not Included, HUC-8 Location of Flood Community CID Sub -Basins Located on FIRM Panels Hazard Data City of Asbury 190053 07060003, 19061 CO215F, 19061 CO220F, 19061 CO238F, 19061 C0332F, 07060005 19061CO335F City of Balltown' 190449 07060003 19061 CO10OF City of Bankston' 190107 07060003, 19061 CO20OF 07060006 City of Bernard' 190028 07060006 19061 CO525F City of Cascade 190117 07060006 19061 C0467F, 19061 CO486F City of Centralia' 190500 07060003, 19061 CO33OF 07060005 19061 CO215F, 19061 CO217F, 19061 CO220F, 19061 CO236F, 19061 CO237F, 19061 CO238F, 19061 CO239F, 19061 CO241 F, City of Dubuque 195180 07060003, 19061 CO242F, 19061 CO243F, 19061 CO244F, 19061 C0330F, 07060005 19061 C0332F, 19061 C0335F, 19061 C0351 F, 19061 C0352F, 19061 C0354F, 19061 C0356F, 19061 C0358F, 19061 C0360F, 19061C0365F,19061C0370F ' No Special Flood Hazard Areas Identified 2 Panel Not Printed Table 1: Listing of NFIP Jurisdictions (continued) If Not Included, HUC-8 Location of Flood Community CID Sub -Basins Located on FIRM Panels Hazard Data 19061 C0025F, 19061 C0050F, 19061 C0075F, 19061 C0100F, 19061 C0125F, 19061 C0135F, 19061 C0145F, 19061 C0155F, 19061 C0160F, 19061 C0161 F, 19061 C0165F, 19061 C0170F, 19061 CO200F, 19061 CO205F, 19061 CO210F, 19061 CO215F, 19061 CO216F, 19061 CO217F, 19061 CO220F, 19061 CO230F, 19061 CO235F, 19061 CO236F, 19061 CO237F, 19061 CO238F, 07060003, 19061 CO241 F, 19061 CO242F, 19061 CO257F, 19061 CO260F, Dubuque County 07060004, 19061 CO269F, 19061 CO270F, 19061 CO276F, 19061 CO278F, (Unincorporated Areas) 190534 07060005, 19061 CO280F, 19061 CO285F, 19061 CO288F, 19061 CO290F, 07060006 19061 CO295F, 19061 C0325F, 19061 C0330F, 19061 C0332F, 19061 C0335F, 19061 C0340F, 19061 C0345F, 19061 C0351 F, 19061 C0352F, 19061 C0353F, 19061 C0354F, 19061 C0358F, 19061 C0360F, 19061 C0365F, 19061 C0370F, 19061 C0400F, 19061 C0425F, 19061 C0435F, 19061 CO445E2, 19061 C0455F, 19061 C0460F, 19061 C0465F, 19061 C0467F, 19061 C0470F, 19061 C0480F, 19061 C0485F, 19061 C0486F, 19061 C0490F, 19061 C0495F, 19061 C0525F, 19061 C0550F City of Durango 190119 07060003 19061 CO217F City of Dyersville 190120 07060006 19061 C0165F, 19061 C0170F, 19061 CO257F, 19061 CO260F, 19061 CO276F, 19061 CO278F, 19061 CO280F, 19061 CO285F City of Epworth 190576 07060003, 07060006 19061 CO325F City of Farley' 190578 07060003, 07060006 19061 CO285F, 19061 CO295F, 19061 C0325F City of Graf 190370 07060003 19061 C0325F, 19061 C0330F City of Holy Cross' 190055 07060003, 07060006 19061 C0160F, 19061 CO200F City of Luxemburg 190040 07060006 19061 CO155F City of New Vienna 190121 07060006 19061 CO161 F No Special Flood Hazard Areas Identified Panel Not Printed Table 1: Listing of NFIP Jurisdictions (continued) Community CID HUC-8 Sub -Basins Located on FIRM Panels If Not Included, Location of Flood Hazard Data City of Peosta 190079 07060005,07060006 19061 C0330F, 19061 C0340F City of Rickardsville 190526 07060003 19061 CO200F, 19061 CO205F City of Sageville 190122 07060003 19061 CO230F, 19061 CO236F, 19061 CO237F City of Sherrill' 190306 07060003 19061 CO21 OF City of Worthington 190123 07060006 19061 CO269F, 19061 CO288F City of Zwingle 190371 07060006 19061 CO55OF ' No Special Flood Hazard Areas Identified 2 Panel Not Printed 1.4 Considerations for using this Flood Insurance Study Report The NFIP encourages State and local governments to implement sound floodplain management programs. To assist in this endeavor, each FIS Report provides floodplain data, which may include a combination of the following: 10-, 4-, 2-, 1-, and 0.2-percent annual chance flood elevations (the 1% annual chance flood elevation is also referred to as the Base Flood Elevation (BFE)); delineations of the 1% annual chance and 0.2% annual chance floodplains; and 1% annual chance floodway. This information is presented on the FIRM and/or in many components of the FIS Report, including Flood Profiles, Floodway Data tables, Summary of Non -Coastal Stillwater Elevations tables, and Coastal Transect Parameters tables (not all components may be provided for a specific FIS). This section presents important considerations for using the information contained in this FIS Report and the FIRM, including changes in format and content. Figures 1, 2, and 3 present information that applies to using the FIRM with the FIS Report. • Part or all of this FIS Report may be revised and republished at any time. In addition, part of this FIS Report may be revised by a Letter of Map Revision (LOMR), which does not involve republication or redistribution of the FIS Report. Refer to Section 6.5 of this FIS Report for information about the process to revise the FIS Report and/or FIRM. It is, therefore, the responsibility of the user to consult with community officials by contacting the community repository to obtain the most current FIS Report components. Communities participating in the NFIP have established repositories of flood hazard data for floodplain management and flood insurance purposes. Community map repository addresses are provided in Table 31, "Map Repositories," within this FIS Report. New FIS Reports are frequently developed for multiple communities, such as entire counties. A countywide FIS Report incorporates previous FIS Reports for individual communities and the unincorporated area of the county (if not jurisdictional) into a single document and supersedes those documents for the purposes of the NFIP. The initial Countywide FIS Report for Dubuque County became effective on October 18, 2011. Refer to Table 28 for information about subsequent revisions to the FIRMs. Previous FIS Reports and FIRMS may have included levees that were accredited as providing protection from the 1 % annual chance flood based on the information available and the mapping standards of the NFIP at that time. For FEMA to continue to accredit the identified levees with providing protection from the base flood, the levees must meet the criteria of the Code of Federal Regulations, Title 44, Section 65.10 (144 CFR 65.10), titled "Mapping of Areas Protected by Levee Systems." Since the status of levees is subject to change at any time, the user should contact the appropriate agency for the latest information regarding levees presented in Table 9 of this FIS Report. For levees owned or operated by the U.S. Army Corps of Engineers (USACE), information may be obtained from the USACE national levee database. For all other levees, the user is encouraged to contact the appropriate local community. • FEMA has developed a Guide to Flood Maps (FEMA 258) and online tutorials to assist users in accessing the information contained on the FIRM. These include how to read 0 panels and step-by-step instructions to obtain specific information. To obtain this guide and other assistance in using the FIRM, visit the FEMA Web site at h!Ltp://www.fema.gov/online-tutorials. The FIRM Index in Figure 1 shows the overall FIRM panel layout within Dubuque County, and also displays the panel number and effective date for each FIRM panel in the county. Other information shown on the FIRM Index includes community boundaries, flooding sources, watershed boundaries, and USGS HUC-8 codes. 7 Figure 1: FIRM Index 114 tZ\eY I141111j.Y 69 CLAYTON COUNTY 0025F 0050F 0075E 0100E 0125F 8/10/2021 8/10/2021 8/10/2021 8/10/2021 8/10/2021 CITY OF HUC8 07060004 CITY OF CITY OF BALLTOWN190449 CITY OF Turkey ILUXEMBURG HOLY CROSS SHERRILL Watershed 190040 190055 / Q 190306 136 Ji P� 04 I 0205FO21OF 0235E **0130E 0135F 0155F °� CITY OF CITY OF 8/10/2021 �° °lei 8/10/20218/10/2021 I 8/10/2021 8/10/2021 RICKARDSVILLE "� DURANGO 11 190526 CITY OF 190119 / CITY OF 0160F 52 ASBURY 0230E 1 8/10/2021 I 8l 0(2021 NEW VIENNA CITY OF CITY OF 90053 02,7E 8/10/2021 190121 10- 0/2021 Vold o a BANKSTON GRAF 8 o12021 8/10/2021 .107 190370 I0165F 020OF 0215F 0220E 0145E 0170E i 0238F 8/10/2021 8/10/2021 8/10/2021 8/10/202,1 8/ 0/2021 SA 012021 0140E 8/10/2021 0257E 0276E - 0330F F 8/10/2021 `0255E a/m/zozl anonCITY O ozl PSD�4 7 Cj Dubuque Count 0372F 0351F FARLEY Unincorporated Areas 81+012021 8/10/2021 DELEWARE 190578 190117 COUNTY 0260E 0285F 0335E 0353E 0278F o28o1 8/10/2021 20 8 40/2021 anonozl 8/10/2021 8/10/2021 8n012021 CITY OF CITY OF 0270E 0290F 0295F CITY OF CITY OF VERSVILLE�/2o21 8/10/20218/10/2021 c EPWORTH PEOSTA CENTRALI 0289E �,.,4fI 9 190576 190079 190500 190120 I 0325E emnos, CITY OF r�t 7 0340F 0345F 0365F 0269E 1- 8%10/2021 8/10/2021 8/10/2021 8/10/4 *0265E OR-T-HINGTON0480ECITY 0525E OFQ4n5i0/2021 C 14:\ VAIA * 010[K1111►11614 HUC8 07060003 Grant -Little Maquoketa / Watershed CITY OF SAGEVILLE 190122 r 0241E 0242F CITY OF 8110/2021 8/1912013 52 DUBUQUE 0243F 0244F 195180 8/19/2013 8/1912013 040OF 0425F 8/10/2021 8/10/2021 52 "Z0370F 8/10/2021 BERNAORD v� °1""e 136 ��4 1190028 q�� a"` � �' Cite, f5F 1 CITY OF 0460E Ig 1052021 CITYJ`OF� 61 ZWING'LE 0/2021 8/1012021 CASCADE 151 1190117 8467E 0486E 8/10/2021 8/10/2021 I1903�71 HUC8 0706000E Maquoketa 055OF 0465F 0470F 0490F 0495F Watershed 8/10/2021 145E 8/10/2021 8/10/2021 8/10/2021 8/10/2021 JACKSON COUNTY JONES COUNTY 1 inch = 25,000 feet 1:300,000 N feet 0 12,500 25,000 50,000 Map Projection: Universal Transverse Mercator Zone 15 North: North American Datum 1983 THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTPS-//MSC. FEMA.GOV SEE FLOOD INSURANCE STUDY FOR ADDITIONAL INFORMATION "PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS **PANEL NOT PRINTED -AREA OUTSIDE COUNTY BOUNDARY z■■■M■■MM �■■■=■■■mm i■�ifi1•��■ JO DAYIESS COUNTY HUC8 07060005 Apple -Plum Watershed NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP INDEX DUBUQUE COUNTY, IOWA and Incorporated Areas o t1ND PANELS PRINTED: 5E�J4 0025, 0050, 0075, 0100, 0125, 0135, 0145, 0155, 0160, 0161, 0165, 00170, 0200, 0205, 0210, 0215, 0216, 0217, 0220, 0230, 0235, 0236, 0237, 0238, 0239, 0241, 0242, 0243, 0244, 0257, 0260, 0269, 0270, 0276, 0278, 0280, 0285, 0288, 0290, 0295, 0325, 0330, FEMA 0332, 0335, 0340, 0345, 0351, 0352, 0353, 0354, 0356, 0358, 0360, 0365, 0370, 0400, 0425, 0435, 0455, 0460, 0465, 0467, 0470, 0480, 0485, 0486, 0490, 0495, 0525, 0550 MAP NUMBER 19061CINDOC MAP REVISED AUGUST 10, 2021 8 Each FIRM panel may contain specific notes to the user that provide additional information regarding the flood hazard data shown on that map. However, the FIRM panel does not contain enough space to show all the notes that may be relevant in helping to better understand the information on the panel. Figure 2 contains the full list of these notes. Figure 2: FIRM Notes to Users NOTES TO USERS For information and questions about this map, available products associated with this FIRM including historic versions of this FIRM, how to order products, or the National Flood Insurance Program in general, please call the FEMA Map Information eXchange at 1-877-FEMA-MAP (1- 877-336-2627) or visit the FEMA Map Service Center website at http://msc.fema.gov. Available products may include previously issued Letters of Map Change, a Flood Insurance Study Report, and/or digital versions of this map. Many of these products can be ordered or obtained directly from the website. Users may determine the current map date for each FIRM panel by visiting the FEMA Map Service Center website or by calling the FEMA Map Information eXchange. Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well as the current FIRM Index. These may be ordered directly from the Map Service Center at the number listed above. For community and countywide map dates, refer to Table 28 in this FIS Report. To determine if flood insurance is available in the community, contact your insurance agent or call the National Flood Insurance Program at 1-800-638-6620. The map is for use in administering the NFIP. It may not identify all areas subject to flooding, particularly from local drainage sources of small size. Consult the community map repository to find updated or additional flood hazard information. BASE FLOOD ELEVATIONS: For more detailed information in areas where Base Flood Elevations (BFEs) and/or floodways have been determined, consult the Flood Profiles and Floodway Data and/or Summary of Stillwater Elevations tables within this FIS Report. Use the flood elevation data within the FIS Report in conjunction with the FIRM for construction and/or floodplain management. FLOODWAY INFORMATION: Boundaries of the floodways were computed at cross sections and interpolated between cross sections. The floodways were based on hydraulic considerations with regard to requirements of the National Flood Insurance Program. Floodway widths and other pertinent floodway data are provided in the FIS Report for this jurisdiction. 0 Figure 2. FIRM Notes to Users (continued) FLOOD CONTROL STRUCTURE INFORMATION: Certain areas not in Special Flood Hazard Areas may be protected by flood control structures. Refer to Section 4.3 "Non -Levee Flood Protection Measures" of this FIS Report for information on flood control structures for this jurisdiction. PROJECTION INFORMATION: The projection used in the preparation of the map was Universal Transverse Mercator (UTM) Zone 15N. The horizontal datum was North American Datum 1983. Differences in datum, spheroid, projection or State Plane zones used in the production of FIRMs for adjacent jurisdictions may result in slight positional differences in map features across jurisdiction boundaries. These differences do not affect the accuracy of the FIRM. ELEVATION DATUM: Flood elevations on the FIRM are referenced to NAVD88. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between the National Geodetic Vertical Datum of 1929 and North American Vertical Datum of 1988, visit the National Geodetic Survey website at http://www.ngs.noaa.gov. Local vertical monuments may have been used to create the map. To obtain current monument information, please contact the appropriate local community listed in Table 31 of this FIS Report. BASE MAP INFORMATION: Base map information shown on the FIRM was provided by the Iowa Geological and Water Survey, Department of Natural Resources (DNR). For information about base maps, refer to Section 6.2 "Base Map" in this FIS Report. The map reflects more detailed and up-to-date stream channel configurations than those shown on the previous FIRM for this jurisdiction. The floodplains and floodways that were transferred from the previous FIRM may have been adjusted to conform to these new stream channel configurations. As a result, the Flood Profiles and Floodway Data tables may reflect stream channel distances that differ from what is shown on the map. Corporate limits shown on the map are based on the best data available at the time of publication. Because changes due to annexations or de -annexations may have occurred after the map was published, map users should contact appropriate community officials to verify current corporate limit locations. NOTES FOR FIRM INDEX REVISIONS TO INDEX: As new studies are performed and FIRM panels are updated within Dubuque County, Iowa and Incorporated Areas, corresponding revisions to the FIRM Index will be incorporated within the FIS Report to reflect the effective dates of those panels. Please refer to Table 28 of this FIS Report to determine the most recent FIRM revision date for each community. The most recent FIRM panel effective date will correspond to the most recent index date. 10 Figure 2. FIRM Notes to Users (continued) SPECIAL NOTES FOR SPECIFIC FIRM PANELS This Notes to Users section was created specifically for Dubuque County, Iowa and Incorporated Areas, effective August 10, 2021. ACCREDITED LEVEE: Check with your local community to obtain more information, such as the estimated level of protection provided (which may exceed the 1-percent-annual-chance level) and Emergency Action Plan, on the levee system(s) shown as providing protection for areas on this panel. To mitigate flood risk in residual risk areas, property owners and residents are encouraged to consider flood insurance and floodproofing or other protective measures. For more information on flood insurance, interested parties should visit www.fema.gov/national-flood-insurance-program. FLOOD RISK REPORT: A Flood Risk Report (FRR) may be available for many of the flooding sources and communities referenced in this FIS Report. The FRR is provided to increase public awareness of flood risk by helping communities identify the areas within their jurisdictions that have the greatest risks. Although non -regulatory, the information provided within the FRR can assist communities in assessing and evaluating mitigation opportunities to reduce these risks. It can also be used by communities developing or updating flood risk mitigation plans. These plans allow communities to identify and evaluate opportunities to reduce potential loss of life and property. However, the FRR is not intended to be the final authoritative source of all flood risk data for a project area; rather, it should be used with other data sources to paint a comprehensive picture of flood risk. Each FIRM panel contains an abbreviated legend for the features shown on the maps. However, the FIRM panel does not contain enough space to show the legend for all map features. Figure 3 shows the full legend of all map features. Note that not all of these features may appear on the FIRM panels in Dubuque County. 11 Figure 3: Map Legend for FIRM SPECIAL FLOOD HAZARD AREAS: The 1 % annual chance flood, also known as the base flood or 100-year flood, has a 1 % chance of happening or being exceeded each year. Special Flood Hazard Areas are subject to flooding by the 1 % annual chance flood. The Base Flood Elevation is the water - surface elevation of the 1 % annual chance flood. The floodway is the channel of a stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1 % annual chance flood can be carried without substantial increases in flood heights. See note for specific types. If the floodway is too narrow to be shown, a note is shown. Special Flood Hazard Areas subject to inundation by the 1 % annual chance flood (Zones A, AE, AH, AO, AR, A99, V and VE) Zone A The flood insurance rate zone that corresponds to the 1 % annual chance floodplains. No base (1 % annual chance) flood elevations (BFEs) or depths are shown within this zone. Zone AE The flood insurance rate zone that corresponds to the 1 % annual chance floodplains. Base flood elevations derived from the hydraulic analyses are shown within this zone, either at cross section locations or as static whole -foot elevations that apply throughout the zone. Zone AH The flood insurance rate zone that corresponds to the areas of 1 % annual chance shallow flooding (usually areas of ponding) where average depths are between 1 and 3 feet. Whole -foot BFEs derived from the hydraulic analyses are shown at selected intervals within this zone. Zone AO The flood insurance rate zone that corresponds to the areas of 1 % annual chance shallow flooding (usually sheet flow on sloping terrain) where average depths are between 1 and 3 feet. Average whole -foot depths derived from the hydraulic analyses are shown within this zone. Zone AR The flood insurance rate zone that corresponds to areas that were formerly protected from the 1 % annual chance flood by a flood control system that was subsequently decertified. Zone AR indicates that the former flood control system is being restored to provide protection from the 1 % annual chance or greater flood. Zone A99 The flood insurance rate zone that corresponds to areas of the 1% annual chance floodplain that will be protected by a Federal flood protection system where construction has reached specified statutory milestones. No base flood elevations or flood depths are shown within this zone. Zone V The flood insurance rate zone that corresponds to the 1 % annual chance coastal floodplains that have additional hazards associated with storm waves. Base flood elevations are not shown within this zone. Zone VE Zone VE is the flood insurance rate zone that corresponds to the 1 % annual chance coastal floodplains that have additional hazards associated with storm waves. Base flood elevations derived from the coastal analyses are shown within this zone as static whole -foot elevations that apply throughout the zone. Regulatory Floodway determined in Zone AE. 12 Figure 3: Map Legend for FIRM (continued) OTHER AREAS OF FLOOD HAZARD Shaded Zone X: Areas of 0.2% annual chance flood hazards and areas of 1 % annual chance flood hazards with average depths of less than 1 foot or with drainage areas less than 1 square mile. Future Conditions 1 % Annual Chance Flood Hazard — Zone X: The flood insurance rate zone that corresponds to the 1 % annual chance floodplains that are determined based on future -conditions hydrology. No base flood elevations or flood depths are shown within this zone. Zone X Protected by Accredited Levee: Areas protected by an accredited levee, dike or other flood control structures. See Notes to Users for important information. OTHER AREAS Zone D (Areas of Undetermined Flood Hazard): The flood insurance rate zone that corresponds to unstudied areas where flood hazards are undetermined, but possible NO SCREEN Unshaded Zone X: Areas determined to be outside the 0.2% annual chance floodplain FLOOD HAZARD AND OTHER BOUNDARY LINES Flood Zone Boundary (white line) Limit of Study Jurisdiction Boundary Limit of Moderate Wave Action (LiMWA): Indicates the inland limit of the area affected by waves greater than 1.5 feet GENERAL STRUCTURES Aqueduct Channel Channel, Culvert, Aqueduct, or Storm Sewer Culvert Storm Sewer Dam Jetty Dam, Jetty, Weir Weir rrrnTTnTnnTrTrFrFm Levee, Dike or Floodwall accredited or provisionally accredited to provide protection from the 1 % annual chance flood Levee, Dike or Floodwall not accredited to provide protection from the 1% annual chance flood. Bridge ridge 13 Figure 3: Map Legend for FIRM (continued) COASTAL BARRIER RESOURCES SYSTEM (CBRS) AND OTHERWISE PROTECTED AREAS (OPA): CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas. See Notes to Users for important information. Coastal Barrier Resources System Area: Labels are shown to clarify where this area shares a boundary with an incorporated area or overlaps with the floodway. CBRS AREA 09/30/2009 Otherwise Protected Area OTHERWISE PROTECTED AREA 09/30/2009 REFERENCE MARKERS ' • River mile Markers CROSS SECTION & TRANSECT INFORMATION 202 Lettered Cross Section with Regulatory Water Surface Elevation (BFE) 21,1 5280 Numbered Cross Section with Regulatory Water Surface Elevation (BFE) 17.5 Unlettered Cross Section with Regulatory Water Surface Elevation (BFE) - - - - - - - Coastal Transect Profile Baseline: Indicates the modeled flow path of a stream and is - - shown on FIRM panels for all valid studies with profiles or otherwise established base flood elevation. Coastal Transect Baseline: Used in the coastal flood hazard model to represent the 0.0-foot elevation contour and the starting point for the transect and the measuring point for the coastal mapping. Base Flood Elevation Line (shown for flooding sources for which no cross sections or profile are available) ZONE AE (EL 16) Static Base Flood Elevation value (shown under zone label) ZONE AO (DEPTH 2) Zone designation with Depth ZONE AO (DEPTH 2) Zone designation with Depth and Velocity (VEL 15 FPS) 14 Figure 3: Map Legend for FIRM (continued) BASE MAP FEATURES Missouri Creek River, Stream or Other Hydrographic Feature 234 Interstate Highway 234 U.S. Highway 234 State Highway 234 County Highway MAPLE LANE Street, Road, Avenue Name, or Private Drive if shown on Flood Profile RAILROAD Horizontal Reference Grid Line Horizontal Reference Grid Ticks + Secondary Grid Crosshairs Land Grant Name of Land Grant 7 Section Number R. 43 W. T. 22 N. Range, Township Number 4276000mE Horizontal Reference Grid Coordinates (UTM) 365000 FT Horizontal Reference Grid Coordinates (State Plane) 800 16' 52.5" Corner Coordinates (Latitude, Longitude) SECTION 2.0 — FLOODPLAIN MANAGEMENT APPLICATIONS 2.1 Floodplain Boundaries To provide a national standard without regional discrimination, the 1% annual chance (100-year) flood has been adopted by FEMA as the base flood for floodplain management purposes. The 0.2% annual chance (500-year) flood is employed to indicate additional areas of flood hazard in the community. Each flooding source included in the project scope has been studied and mapped using professional engineering and mapping methodologies that were agreed upon by FEMA and Dubuque County as appropriate to the risk level. Flood risk is evaluated based on factors such as known flood hazards and projected impact on the built environment. Engineering analyses were performed for each studied flooding source to calculate itsl% annual chance flood elevations; elevations corresponding to other floods (e.g. 10-, 4-, 2-, 0.2-percent annual chance, etc.) may have also been computed for 15 certain flooding sources. Engineering models and methods are described in detail in Section 5.0 of this FIS Report. The modeled elevations at cross sections were used to delineate the floodplain boundaries on the FIRM; between cross sections, the boundaries were interpolated using elevation data from various sources. More information on specific mapping methods is provided in Section 6.0 of this FIS Report. Depending on the accuracy of available topographic data (Table 23), study methodologies employed (Section 5.0), and flood risk, certain flooding sources may be mapped to show both the 1% and 0.2% annual chance floodplain boundaries, regulatory water surface elevations (BFEs), and/or a regulatory floodway. Similarly, other flooding sources may be mapped to show only the 1% annual chance floodplain boundary on the FIRM, without published water surface elevations. In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the 1 % annual chance floodplain boundary is shown on the FIRM. Figure 3, "Map Legend for FIRM", describes the flood zones that are used on the FIRMs to account for the varying levels of flood risk that exist along flooding sources within the project area. Table 2 and Table 3 indicate the flood zone designations for each flooding source and each community within Dubuque County, respectively. Table 2, "Flooding Sources Included in this FIS Report," lists each flooding source, including its study limits, affected communities, mapped zone on the FIRM, and the completion date of its engineering analysis from which the flood elevations on the FIRM and in the FIS Report were derived. Descriptions and dates for the latest hydrologic and hydraulic analyses of the flooding sources are shown in Table 13. Floodplain boundaries for these flooding sources are shown on the FIRM (published separately) using the symbology described in Figure 3. On the map, the 1% annual chance floodplain corresponds to the SFHAs. The 0.2% annual chance floodplain shows areas that, although out of the regulatory floodplain, are still subject to flood hazards. Small areas within the floodplain boundaries may lie above the flood elevations but cannot be shown due to limitations of the map scale and/or lack of detailed topographic data. The procedures to remove these areas from the SFHA are described in Section 6.5 of this FIS Report. 2.2 Floodways Encroachment on floodplains, such as structures and fill, reduces flood -carrying capacity, increases flood heights and velocities, and increases flood hazards in areas beyond the encroachment itself. One aspect of floodplain management involves balancing the economic gain from floodplain development against the resulting increase in flood hazard. For purposes of the NFIP, a floodway is used as a tool to assist local communities in balancing floodplain development against increasing flood hazard. With this approach, the area of the 1% annual chance floodplain on a river is divided into a floodway and a floodway fringe based on hydraulic modeling. The floodway is the channel of a stream, plus any adjacent floodplain areas, that must be kept free of encroachment in order to carry the 1 % annual chance flood. The floodway fringe is the area between the floodway and the 1% annual chance floodplain boundaries where encroachment is permitted. The floodway must be wide enough so that the floodway fringe could be completely obstructed without increasing the water -surface elevation of the 1% annual chance flood more than 1 foot at any point. Typical relationships between the floodway and the floodway fringe and their significance to floodplain development are shown in Figure 4. 16 To participate in the NFIP, Federal regulations require communities to limit increases caused by encroachment to 1.0 foot, provided that hazardous velocities are not produced. The floodways in this project are presented to local agencies as minimum standards that can be adopted directly or that can be used as a basis for additional floodway projects. Figure 4: Floodway Schematic LIMIT OF FLOODPLAIN FOR UNENCROACHED 1 % ANNUAL CHANCE FLOOD �FLOODWAY� FLOODWAY FLOODWAY� FRINGE FRINGE STREAM CHANNEL FLOOD ELEVATION WHEN GROUND SURFACE CONFINED WITHIN FLOODWAY ENCROACHMENT ENCROACHMENT C D FILL FILL SURCHARGE* - - - - - - - - - - - - - - - - A B AREA OF ALLOWABLE FILL ENCROACHMENT; RAISING FLOOD ELEVATION GROUND SURFACE WILL BEFORE ENCROACHMENT NOT CAUSE A SURCHARGE ON FLOODPLAIN THAT EXCEEDS THE INDICATED STANDARDS LINE A - B IS THE FLOOD ELEVATION BEFORE ENCROACHMENT LINE C - D IS THE FLOOD ELEVATION AFTER ENCROACHMENT *SURCHARGE NOT TO EXCEED 1.0 FOOT (FEMA REQUIREMENT) OR LESSER HEIGHT IF SPECIFIED BY STATE OR COMMUNITY. 17 Table 2: Flooding Sources Included in this FIS Report Area (mil) Zone HUC-8 Length (mi) (estuaries shown Sub- (streams or or Floodway on Date of Source Community Downstream Limit Upstream Limit Basins coastlines) ponding) (Y/N FIRM Analysis -Flooding Confluence with 0.2 miles upstream Bear Creek City of Dyersville North Fork of Chicago Great 07060006 1.9 Y AE 1992 Maquoketa River Western Railroad City of Sageville, Confluence with Approximately 54 Bloody Run Dubuque County Little Maquoketa feet downstream of 07060003 1.7 Y AE 1992 Unincorporated Areas River Mud Lake Road City of Dubuque, Approximately 53 Catfish Creek Dubuque County Confluence with feet downstream of 07060005 8.0 Y AE 1992 Unincorporated Areas Mississippi River Oakland Farms Road Confluence with Approximately 59 Cloie Branch Dubuque County Little Maquoketa feet downstream of 07060003 2.8 Y AE 1992 Unincorporated Areas River Derby Grange Road Confluence with Approximate 0.5 Couler Valley Dubuque County Little Maquoketa miles upstream of 07060003 2.1 Y AE 1992 Creek Unincorporated Areas River South John Deere Road Couler Valley City of Sageville, Confluence with Approximately 0.2 Creek Tributary Dubuque County Couler Valley miles upstream of 07060003 0.3 Y AE 1992 Unincorporated Areas Creek Sageville Road City of Worthington, Approximately 21 Durion Creek Dubuque County At Delaware feet downstream 07060006 2.2 Y AE 1992 Unincorporated Areas County Boundary from Olde Worthington Road City of Dubuque, Approximately 64 Granger Creek Dubuque County Confluence with feet downstream of 07060005 4.1 Y AE 1992 Unincorporated Areas Catfish Creek Olde Davenport Road im Table 2: Flooding Sources Included in this FIS Report (continued) Area (mil) Zone HUC-8 Length (mi) (estuaries shown Sub- (streams or or Floodway on Date of Source Community Downstream Limit Upstream Limit Basins coastlines) ponding) (Y/N FIRM Analysis -Flooding City of Dyersville, Confluence with Approximately 161 Hewitt Creek Dubuque County North Fork feet downstreamom the confluence fr from 07060006 3.2 Y AE 1992 Unincorporated Areas Maquoketa River Hickory Creek Hewitt Creek City of Dyersville, Confluence with Approximately 1.5 Tributary Dubuque County Hewitt Creek miles upstream of 07060006 1.7 Y AE 1992 Unincorporated Areas 121' Street NE At Old Chicago, Approximately 117 Little Maquoketa City of Sageville, Milwaukee, St. feet downstream of River Dubuque County Paul, and Pacific County Highway 07060003 12.7 Y AE 1992 Unincorporated Areas Railroad Y21 (aka Budd Road) Middle Fork Confluence with Approximately 1.1 Catfish Creek City of Dubuque Catfish Creek miles upstream of 07060005 8.3 Y AE 1992 State Highway 32 Mississippi River City of Dubuque, Dubuque County At Jackson County At Clayton County 07060003, 34.3 Y AE 2004 Unincorporated Areas boundary boundary 07060005 North Fork Confluence with Approximately 0.7 Catfish Creek City of Dubuque Middle Fork miles upstream of 07060005 1.6 Y AE 1992 Catfish Creek University Avenue Confluence with Approximately 59 North Fork Little Dubuque County Little Maquoketa feet upstream of 07060003 2.3 Y AE 1992 Maquoketa River Unincorporated Areas River US Highway 52 (aka State Hwy 3) North Fork Little Dubuque County Confluence with Approximately 0.3 Maquoketa River Unincorporated Areas North Fork Little miles upstream of 07060003 2.1 Y AE 1992 Tributary Maquoketa River Valley Ridge Road North Fork City of Cascade, At Jones County Approximately 41 Maquoketa River Dubuque County boundary ry feet downstream of 07060006 4.2 Y AE 1992 Unincorporated Areas State Highway 136 19 Table 2: Flooding Sources Included in this FIS Report (continued) Area (mil) Zone HUC-8 Length (mi) (estuaries shown Sub- (streams or or Floodway on Date of Source Community Downstream Limit Upstream Limit Basins coastlines) ponding) (Y/N FIRM Analysis -Flooding North Fork City of Dyersville, At County Highway Maquoketa River City of New Vienna At Delaware D17 (aka New 07060006 13.8 Y AE 1992 (continued) Dubuque County County Boundary Vienna Road) Unincorporated Areas North Fork City of Dyersville, Confluence with Approximately 0.5 Maquoketa River Dubuque County North Fork miles upstream of 07060006 1.7 Y AE 1992 Tributary Unincorporated Areas Maquoketa River Oak Street City of Durango, Confluence with Just downstream of Sherrill Creek Dubuque County Little Maquoketa Hochrein Road 07060003 0.8 Y AE 1992 Unincorporated Areas River South Fork City of Dubuque, Confluence with Approximately 0.1 Catfish Creek Dubuque County Catfish Creek miles upstream of 07060005 7.5 Y AE 1992 Unincorporated Areas Cousins Road Confluence with Approximately 0.4 Couler Valley miles upstream of 1.2 Creek County Hwy Y14 Union Park City of Sageville, (aka Kennedy Rd) Hollow Creek Dubuque County 07060003 Y AE 1992 Unincorporated Areas Approximately 0.8 Approximately 1.3 miles upstream of miles upstream of 0.5 County Hwy Y14 County Hwy Y14 (aka Kennedy Rd) (aka Kennedy Rd) 20 Table 2: Flooding Sources Included in this FIS Report (continued) Source Community Downstream Limit Upstream Limit HUC-8 Sub- Basins Length (mi) (streams or coastlines) Area (mil) (estuaries or ponding) Floodway (Y/N Zone shown on FIRM Date of Analysis -Flooding City of Asbury, City of Cascade, City of Dubuque, Dubuque County (Unincorporated Areas), City of Dyersville, 07060003, All Approximate City of Epworth, Downstream limit Upstream limit of 07060004, 441.0 N A 2014 Flooding City of Graf, of study study 07060005, City of Luxemburg, 07060006 City of New Vienna, City of Peosta, City of Rickardsville, City of Sageville, City of Worthington, City of Zwin le 21 Floodway widths presented in this FIS Report and on the FIRM were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. For certain stream segments, floodways were adjusted so that the amount of floodwaters conveyed on each side of the floodplain would be reduced equally. The results of the floodway computations have been tabulated for selected cross sections and are shown in Table 24, "Floodway Data." All floodways that were developed for this FIS project are shown on the FIRM using the symbology described in Figure 3. In cases where the floodway and 1% annual chance floodplain boundaries are either close together or collinear, only the floodway boundary has been shown on the FIRM. For information about the delineation of floodways on the FIRM, refer to Section 6.3. 2.3 Base Flood Elevations The hydraulic characteristics of flooding sources were analyzed to provide estimates of the elevations of floods of the selected recurrence intervals. The Base Flood Elevation (BFE) is the elevation of the 1% annual chance flood. These BFEs are most commonly rounded to the whole foot, as shown on the FIRM, but in certain circumstances or locations they may be rounded to 0.1 foot. Cross section lines shown on the FIRM may also be labeled with the BFE rounded to 0.1 foot. Whole -foot BFEs derived from engineering analyses that apply to coastal areas, areas of ponding, or other static areas with little elevation change may also be shown at selected intervals on the FIRM. Cross sections with BFEs shown on the FIRM correspond to the cross sections shown in the Floodway Data table and Flood Profiles in this FIS Report. BFEs are primarily intended for flood insurance rating purposes. For construction and/or floodplain management purposes, users are cautioned to use the flood elevation data presented in this FIS Report in conjunction with the data shown on the FIRM. 2.4 Non -Encroachment Zones This section is not applicable to this FIS project. 2.5 Coastal Flood Hazard Areas 2.5.1 Water Elevations and the Effects of Waves This section is not applicable to this FIS project. Figure 5: Wave Runup Transect Schematic [Not Applicable to this Flood Risk Project] 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas This section is not applicable to this FIS project. 2.5.3 Coastal High Hazard Areas This section is not applicable to this Flood Risk Project. 22 Figure 6: Coastal Transect Schematic [Not Applicable to this Flood Risk Project] 2.5.4 Limit of Moderate Wave Action This section is not applicable to this Flood Risk Project. SECTION 3.0 — INSURANCE APPLICATIONS 3.1 National Flood Insurance Program Insurance Zones For flood insurance applications, the FIRM designates flood insurance rate zones as described in Figure 3, "Map Legend for FIRM." Flood insurance zone designations are assigned to flooding sources based on the results of the hydraulic or coastal analyses. Insurance agents use the zones shown on the FIRM and depths and base flood elevations in this FIS Report in conjunction with information on structures and their contents to assign premium rates for flood insurance policies. The 1 % annual chance floodplain boundary corresponds to the boundary of the areas of special flood hazards (e.g. Zones A, AE, V, VE, etc.), and the 0.2% annual chance floodplain boundary corresponds to the boundary of areas of additional flood hazards. Table 3 lists the flood insurance zones in the unincorporated and incorporated areas of Dubuque County. 23 Table 3: Flood Zone Designations by Community Community Flood Zone(s) City of Asbury A, X City of Balltown X City of Bankston X City of Bernard X City of Cascade A, AE, X City of Centralia X City of Dubuque A, AE, X Dubuque County (Unincorporated Areas) A, AE, X City of Durango AE, X City of Dyersville A, AE, X City of Epworth A, X City of Farley X City of Graf A, X City of Holy Cross X City of Luxemburg A, X City of New Vienna A, AE, X City of Peosta A, X City of Rickardsville A, X City of Sageville A, AE, X City of Sherrill X City of Worthington A, AE, X City of Zwingle A, X 3.2 Coastal Barrier Resources System This section is not applicable to this FIS project. Table 4: Coastal Barrier Resources System Information [Not Applicable to this Flood Risk Project] 24 SECTION 4.0 — AREA STUDIED 4.1 Basin Description Table 5 contains a description of the characteristics of the HUC-8 sub -basins within which each community falls. The table includes the main flooding sources within each basin, a brief description of the basin, and its drainage area. Table 5: Basin Characteristics Drainage HUC-8 Primary Area HUC-8 Sub- Sub -Basin Flooding (square Basin Name Number Source Description of Affected Area miles) This is the Dubuque County portion of the Apple -Plum, HUC8 Apple -Plum 07060005 Plum River ID (07060005), which drains to the 110 Upper Mississippi -Maquoketa - Plum River Basin This is the Dubuque County Little portion of the Grant -Little Grant -Little 07060003 Maquoketa Maquoketa, HUC8 ID (07060003), 190 Maquoketa River which drains to the Upper Mississippi -Maquoketa -Plum River Basin This is the Dubuque County Maquoketa portion of the Maquoketa, HUC8 ID Maquoketa 07060006 River (07060006), which drains to the 305 Upper Mississippi -Maquoketa - Plum River Basin This is the Dubuque County portion of the Turkey, HUC8 ID Turkey 07060004 Turkey River (07060004), which drains to the 12 Upper Mississippi -Maquoketa - Plum River Basin 4.2 Principal Flood Problems Table 6 contains a description of the principal flood problems that have been noted for Dubuque County by flooding source. Table 6: Principal Flood Problems Flooding Source Description of Flood Problems Catfish Creek In 1876, ravine flooding killed 40 persons and caused $28,000 damage on Catfish Creek. Serious ravine flooding in the Catfish Creek basin was also reported in 1852, 1857, 1918, and 1919. The 1918 peak discharge was estimated at 28,100 cfs and the 1919 flood at 13,550 cfs. Systematic records of floods are not available for Catfish Creek and flood stages were not given. 25 Table 6: Principal Flood Problems (continued) Flooding Source Description of Flood Problems Little For the Little Maquoketa River basin, large floods were reported in 1895 Maquoketa and 1919. The largest floods in this century recorded near Durango had River stages and discharges of 22.1 feet and 29,000 cfs in 1925, 21.7 feet and 23,900 cfs in September 1972, 23.8 feet and 40,000 cfs in August 1972. Mississippi For the Mississippi River, the highest flood stages and discharges were River 26.5 feet and 306,500 cubic feet per second (cfs) in April 1965; 23.1 feet and 231,000 cfs in 1969; and 22.8 feet and 225,000 cfs in 1975. Although no data are available, numerous floods for the Mississippi River are reported for the 19th century, the highest appearing to be those of May 1826, July 1876, and spring 1888. North Fork North Fork Maquoketa River basin, periodic flooding has also been Maquoketa reported during the 20th century. Ice jamming resulted in additional River problems in the 1965 flood, which came within a few feet of the bridge in the City of Cascade. Table 7 contains information about historic flood elevations in the communities within Dubuque County. Table 7: Historic Flooding Elevations [Not Applicable to this Flood Risk Project] 4.3 Non -Levee Flood Protection Measures Table 8 contains information about non -levee flood protection measures within Dubuque County such as dams, jetties, and or dikes. Levees are addressed in Section 4.4 of this FIS Report. Table 8: Non -Levee Flood Protection Measures [Not Applicable to this Flood Risk Project] 4.4 Levees For purposes of the NFIP, FEMA only recognizes levee systems that meet, and continue to meet, minimum design, operation, and maintenance standards that are consistent with comprehensive floodplain management criteria. The Code of Federal Regulations, Title 44, Section 65.10 (44 CFR 65.10) describes the information needed for FEMA to determine if a levee system reduces the risk from the 1% annual chance flood. This information must be supplied to FEMA by the community or other party when a flood risk study or restudy is conducted, when FIRMS are revised, or upon FEMA request. FEMA reviews the information for the purpose of establishing the appropriate FIRM flood zone. Levee systems that are determined to reduce the risk from the 1% annual chance flood are accredited by FEMA. FEMA can also grant provisional accreditation to a levee system that was previously accredited on an effective FIRM and for which FEMA is awaiting data and/or documentation to demonstrate compliance with Section 65.10. These levee systems are referred to as Provisionally Accredited Levees, or PALS. Provisional accreditation provides communities and levee owners with a specified timeframe to obtain the necessary data to confirm the levee's 26 certification status. Accredited levee systems and PALS are shown on the FIRM using the symbology shown in Figure 3 and in Table 9. If the required information for a PAL is not submitted within the required timeframe, or if information indicates that a levee system not longer meets Section 65.10, FEMA will de -accredit the levee system and issue an effective FIRM showing the levee -impacted area as a SFHA. FEMA coordinates its programs with USACE, who may inspect, maintain, and repair levee systems. The USACE has authority under Public Law 84-99 to supplement local efforts to repair flood control projects that are damaged by floods. Like FEMA, the USACE provides a program to allow public sponsors or operators to address levee system maintenance deficiencies. Failure to do so within the required timeframe results in the levee system being placed in an inactive status in the USACE Rehabilitation and Inspection Program. Levee systems in an inactive status are ineligible for rehabilitation assistance under Public Law 84-99. FEMA coordinated with the USACE, the local communities, and other organizations to compile a list of levees that exist within Dubuque County. Table 9, "Levees," lists all accredited levees, PALS, and de -accredited levees shown on the FIRM for this FIS Report. Other categories of levees may also be included in the table. The Levee ID shown in this table may not match numbers based on other identification systems that were listed in previous FIS Reports. Levees identified as PALs in the table are labeled on the FIRM to indicate their provisional status. Please note that the information presented in Table 9 is subject to change at any time. For that reason, the latest information regarding any USACE structure presented in the table should be obtained by contacting USACE and accessing the USACE National Levee Database. For levees owned and/or operated by someone other than the USACE, contact the local community shown in Table 31. Please note that FEMA has identified levees in this jurisdiction that have not been demonstrated by the community or levee owner to meet the requirements of 44 CFR 65.10 of the NFIP regulations as it relates to the levee's capacity to provide 1-percent-annual-chance flood protection. As such, the existing flood hazard analysis in the affected areas has been carried forward from the previously -printed effective FIRM panel(s) and the area has been clearly identified on the FIRM panel with notes and bounding lines. This has been done to inform users that a temporary mapping action has been put in place until such time as FEMA is able to initiate a new flood risk project to apply new flood hazard mapping procedures for leveed areas. These levees occur on FIRM panel 19061 C0467F. 27 Table 9: Levees Covered Under USACE PL84-99 Community Flooding Source Levee Location Levee Owner Levee Levee ID Program? FIRM Panel(s) Levee Status City of Cascade North Fork Maquoketa River West Bank City of Cascade No 5105590200 Yes 19061C0467F Non -Accredited LFP City of Cascade North Fork Maquoketa River East Bank Locally owned No 1705000406 No 19061 C0467F Non -Accredited 19061 CO242F, 19061 CO243F, City of Dubuque Mississippi River West Bank City of Dubuque No 5105090001 Yes 19061 CO244F, Accredited 19061 C0356F, 19061C0360F m SECTION 5.0 — ENGINEERING METHODS For the flooding sources in the community, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this study. Flood events of a magnitude that are expected to be equaled or exceeded at least once on the average during any 10-, 25-, 50-, 100-, or 500-year period (recurrence interval) have been selected as having special significance for floodplain management and for flood insurance rates. These events, commonly termed the 10-, 25- , 50-, 100-, and 500-year floods, have a 10-, 4-, 2-, 1-, and 0.2% annual chance, respectively, of being equaled or exceeded during any year. Although the recurrence interval represents the long-term, average period between floods of a specific magnitude, rare floods could occur at short intervals or even within the same year. The risk of experiencing a rare flood increases when periods greater than 1 year are considered. For example, the risk of having a flood that equals or exceeds the 100-year flood (1-percentchance of annual exceedance) during the term of a 30-year mortgage is approximately 26-percent (about 3in 10); for any 90-year period, the risk increases to approximately 60 percent (6 in 10). The analyses reported herein reflect flooding potentials based on conditions existing in the community at the time of completion of this study. Maps and flood elevations will be amended periodically to reflect future changes. The engineering analyses described here incorporate the results of previously issued Letters of Map Change (LOMCs) listed in Table 27, "Incorporated Letters of Map Change", which include Letters of Map Revision (LOMRs). For more information about LOMRs, refer to Section 6.5, "FIRM Revisions." 5.1 Hydrologic Analyses Hydrologic analyses were carried out to establish the peak elevation -frequency relationships for floods of the selected recurrence intervals for each flooding source studied. Hydrologic analyses are typically performed at the watershed level. Depending on factors such as watershed size and shape, land use and urbanization, and natural or man-made storage, various models or methodologies may be applied. A summary of the hydrologic methods applied to develop the discharges used in the hydraulic analyses for each stream is provided in Table 13. Greater detail (including assumptions, analysis, and results) is available in the archived project documentation. A summary of the discharges is provided in Table 10. Frequency Discharge -Drainage Area Curves used to develop the hydrologic models may also be shown in Figure 7 for selected flooding sources. A summary of stillwater elevations developed for non -coastal flooding sources is provided in Table 11. (Coastal Stillwater elevations are discussed in Section 5.3 and shown in Table 17.) Stream gage information is provided in Table 12. 29 Table 10: Summary of Discharges Peak Discharge cfs Flooding Drainage Area 10% Annual 2% Annual 1 % Annual 0.2% Annual Source Location Square Miles Chance Chance Chance Chance At confluence with 37.0 4,700 9,200 11,700 20,000 Bear Creek North Fork Maquoketa River At confluence with 8.9 2,410 4,380 5,370 7,770 Bloody Run Little Maquoketa River At confluence with 70.6 8,100 15,300 19,500 32,200 Mississippi River At confluence with 40.0 5,000 9,400 11,800 19,500 Middle Fork Catfish Creek Catfish Creek Upstream of 22.3 3,650 6,950 8,750 14,800 confluence with South Fork Catfish Creek Upstream of study 18.2 3,400 6,450 8,200 12,180 limit At confluence with 6.5 2,480 4,420 5,370 7,670 Little Maquoketa River Cloie Branch About 5,700 feet upstream of 5.3 2,290 4,090 4,990 7,140 confluence with Little Maquoketa River 30 Table 10: Summary of Discharges (continued) Peak Discharge cfs 10% Annual 2% Annual 1 % Annual 0.2% Annual Flooding Drainage Area Source Location Square Miles Chance Chance Chance Chance Couler Valley At confluence with Creek Tributary Couler Valley 0.8 675 1,060 1,230 1,625 Creek Downstream county oundary 11.4 2,420 4,400 5,470 7,910 Durion Creek Upstream of corporate limits of 6.1 1,760 3,320 4,150 6,150 Worthington At confluence with Catfish Creek 15.0 3,940 6,700 8,010 11,120 Just upstream of Granger Creek confluence with 11.6 3,560 6,090 7,300 10,170 Tributary Q Just upstream of confluence with 7.9 3,080 5,320 6,390 8,950 Tributary R Hewitt Creek Upstream of corporate limits of 27.7 4,100 8,000 10,200 17,500 Dyersville Hewitt Creek Upstream of corporate limits of 8.6 2,200 4,300 5,500 9,400 Tributary Dyersville 31 Table 10: Summary of Discharges (continued) Peak Discharge cfs 10% Annual 2% Annual 1 % Annual 0.2% Annual Drainage Area Source Location (Square Miles Chance Chance Chance Chance -Flooding At mouth 157 19,290 33,050 39,870 58,110 Upstream of confluence with Cloie Branch - 130 17,710 30,350 36,610 53,860 Little Maquoketa gage No. 4145.00 River Upstream of confluence with North Fork Little 54 5,870 8,210 9,170 11,270 Maquoketa River - a e No. 4143.50 Middle Fork Upstream of Catfish Creek corporate limits of 7.2 1,920 3,720 4,770 8,180 City of Dubuque At Lock & Dam 12 82,400 196,000 252,000 275,000 327,000 Downstream of Mississippi River Lock & Dam 11 82,100 195,000 251,000 274,000 326,000 Downstream of Lock & Dam 10 79,370 197,000 255,000 279,000 334,000 At confluence with Middle Fork 4.0 1,370 2,750 3,600 6,400 Catfish Creek North Fork Catfish Creek Approximately 910 feet downstream of John F Kennedy 2.1 1,340 Road 32 Table 10: Summary of Discharges (continued) Peak Discharge cfs 10% Annual 2% Annual 1 % Annual 0.2% Annual Drainage Area Flooding Source Location (Square Miles Chance Chance Chance Chance At confluence with Little 70.0 13,410 22,970 27,710 40,390 Maquoketa River Just downstream of confluence North Fork with Middle Fork 63.2 12,800 21,940 26,470 38,580 Little Little Maquoketa River Maquoketa River Just upstream of confluence with Middle Fork 30 4,210 6,640 7,710 10,210 Maquoketa River Upstream study limit -gage No. 21.6 3,630 5,730 6,650 8,810 4144.50 At confluence with North Fork Little Maquoketa 5.3 2,160 3,920 4,800 6,940 North Fork River Little Maquoketa About 7,500 feet River Tributary upstream of confluence with 4.1 2,020 3,650 4,470 6,440 North Fork Little Maquoketa River 33 Table 10: Summary of Discharges (continued) Peak Dischar e cfs 10% Annual 2% Annual 1 % Annual 0.2% Annual Flooding Drainage Area Source Location Square Miles Chance Chance Chance Chance Approximately 4.6 miles downstream of U.S. Highway 211.7 10,015 15,970 19,090 30,000 151, at the downstream county boundary About 5,400 feet upstream of Cascade 198.3 9,650 15,411 18,423 29,241 corporate limits North Fork Approximately 5 Maquoketa miles River downstream of 125.0 8,112 13,181 15,895 25,678 western county boundary Upstream of Hewitt Creek 44.4 4,591 7,615 9.183 15,107 About 2.4 miles upstream of 37.2 4,165 6,934 8,361 13,800 Tributary C About 300 feet downstream of New Vienna 28.6 3,604 6,032 7,274 12,063 cor orate limits North Fork At confluence Maquoketa with North Fork 3.9 1,560 2,280 2,610 3,420 River Tributary Maquoketa River At confluence Sherill Creek with Little 3.8 1,850 3,400 4,180 6,090 Maquoketa River 34 Table 10: Summary of Discharges (continued) Peak Discharge cfs 10% Annual 2% Annual 1 % Annual 0.2% Annual Drainage Area Source Location Square Miles Chance Chance Chance Chance -Flooding Upstream of corporate limits of 17.4 3,130 6,100 7,800 13,500 City of Dubuque South Fork Just upstream of Catfish Creek Cascade Road 14.5 2,840 5,530 7,080 12,240 About 1,000 feet downstream of 10.9 2,440 4,750 6,080 10,520 U.S. Highway 20 Upstream of City of Dubuque corporate limits -gage No. 0.9 650 1,010 1,170 1,540 Union Park 4146.00 Hollow About 300 feet upstream of City of Dubuque corporate 0.6 540 840 970 1,280 limits Figure 7: Frequency Discharge -Drainage Area Curves [Not Applicable to this Flood Risk Project] 35 Table 11: Summary of Non -Coastal Stillwater Elevations Elevations (feet NAVD88) 10% Annual 4% Annual 2% Annual 1 % Annual 0.2% Annual Flooding Source Location Chance Chance Chance Chance Chance Interior Drainage to Levee -At Shiras City of Dubuque * * * 599.0 Avenue Interior Drainage to Levee -At Bee City of Dubuque * 601.5 Branch Interior Drainage to Levee -At Ice City of Dubuque * * * 600.8 Harbor Harbor Interior Drainage to Levee City of Dubuque * * * 599.5 — At Maus Park *Data not available Table 12: Stream Gage Information used to Determine Discharges [Not Applicable to this Flood Risk Project] 36 5.2 Hydraulic Analyses Analyses of the hydraulic characteristics of flooding from the sources studied were carried out to provide estimates of the elevations of floods of the selected recurrence intervals. Base flood elevations on the FIRM represent the elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report. Rounded whole -foot elevations may be shown on the FIRM in coastal areas, areas of ponding, and other areas with static base flood elevations. These whole -foot elevations may not exactly reflect the elevations derived from the hydraulic analyses. Flood elevations shown on the FIRM are primarily intended for flood insurance rating purposes. For construction and/or floodplain management purposes, users are cautioned to use the flood elevation data presented in this FIS Report in conjunction with the data shown on the FIRM. The hydraulic analyses for this FIS were based on unobstructed flow. The flood elevations shown on the profiles are thus considered valid only if hydraulic structures remain unobstructed, operate properly, and do not fail. For streams for which hydraulic analyses were based on cross sections, locations of selected cross sections are shown on the Flood Profiles (Exhibit 1). For stream segments for which a floodway was computed (Section 6.3), selected cross sections are also listed on Table 24, "Floodway Data." A summary of the methods used in hydraulic analyses performed for this project is provided in Table 13. Roughness coefficients are provided in Table 14. Roughness coefficients are values representing the frictional resistance water experiences when passing overland or through a channel. They are used in the calculations to determine water surface elevations. Greater detail (including assumptions, analysis, and results) is available in the archived project documentation. 37 Table 13: Summary of Hydrologic and Hydraulic Analyses Hydrologic Hydraulic Date Flood Study Limits Model or Model or Analyses Zone on Flooding Source Downstream Limit Upstream Limit Method Used Method Used Completed FIRM Special Considerations Confluence with 0.2 miles Iowa Bear Creek North Fork upstream of Regional Slope -area 07/1992 AE w/ Maquoketa River Chicago Great Equations method Floodway Western Railroad Confluence with Approximately 54 Iowa Slope -area AE w/ Bloody Run Little Maquoketa feet downstream Regional method 07/1992 Floodway River of Mud Lake Road Equations Approximately 53 Iowa Catfish Creek Confluence with feet downstream Regional Slope -area 07/1992 AE w/ Mississippi River of Oakland Farms Equations method Floodway Road Confluence with Approximately 59 Iowa Cloie Branch Little Maquoketa feet downstream Regional Slope -area 07/1992 AE w/ River of Derby Grange Equations method Floodway Road Confluence with Approximately 0. 5 Iowa Couler Valley Little Maquoketa miles upstream of Regional Slope -area 07/1992 AE w/ Creek River South John Deere Equations method Floodway Road Couler Valley Confluence with Approximately 0.2 Iowa Slope -area AE w/ Creek Couler Valley miles upstream of Regional method 07/1992 Floodway Tributary Creek Sageville Road Equations Approximately 21 Iowa Durion Creek At Delaware feet downstream Regional Slope -area 07/1992 AE w/ County Boundary from Olde Equations method Floodway Worthington Road Approximately 64 Iowa Granger Creek Confluence with feet downstream Regional Slope -area 07/1992 AE w/ Catfish Creek of Olde Davenport Equations method Floodway Road m Table 13: Summary of Hydrologic and Hydraulic Analyses (continued) Hydrologic Hydraulic Date Flood Study Limits Model or Model or Analyses Zone on Flooding Source Downstream Limit Upstream Limit Method Used Method Used Completed FIRM Special Considerations Approximately 161 Confluence with feet downstream Iowa AE w/ Hewitt Creek North Fork from the Regional Field Survey 07/1992 Floodway Maquoketa River confluence of Equations Hickory Creek Hewitt Creek Confluence with Approximately 1.5 Iowa AE w/ Tributary Hewitt Creek miles upstream of Regional Field Survey 07/1992 Floodway 12'h Street NE Equations Interior Drainage - Mississippi Downstream limit Upstream limit of 03/2012 AE River Levee of study study Ponding At Old Chicago, Approximately 117 Little Milwaukee, St. feet downstream Log - Slope -area AE w/ Maquoketa Paul, and Pacific from County Hwy Pearson method 07/1992 Floodway River Railroad Y21 (aka Budd Type III Rd) Middle Fork Confluence with Approximately 1.1 Iowa Slope -area AE w/ Catfish Creek Catfish Creek miles upstream of Regional method 07/1992 Floodway State Hwy 32 Equations Mississippi At Jackson At Clayton County HEC- UNET/HEC- 2004 AE w/ River County boundary boundary HMS/HEC-1 RAS 3.1.3 Floodway Confluence with Approximately 0.7 Iowa North Fork Middle Fork miles upstream Regional Slope -area 07/1992 AE w/ Catfish Creek Catfish Creek from University Equations method Floodway Avenue North Fork Confluence with Approximately 59 Log - Little Little Maquoketa feet upstream of Pearson Slope -area 07/1992 AE w/ Maquoketa River US Hwy 52 (aka Type III method Floodway River State Hwy 3) * Data not available 39 Table 13: Summary of Hydrologic and Hydraulic Analyses (continued) Hydrologic Hydraulic Date Flood Study Limits Model or Model or Analyses Zone on Flooding Source Downstream Limit Upstream Limit Method Used Method Used Completed FIRM Special Considerations North Fork Little Confluence with Approximately 0.3 Iowa Slope -area AE w/ Maquoketa North Fork Little miles upstream of Regional method 07/1992 Floodway River Tributary Maquoketa River Valley Ridge Road Equations At Jones County Approximately 41 boundary feet downstream North Fork of State Hwy 136 Iowa Maquoketa Regional Field Survey 07/1992 Floodway y At County River At Delaware Highway D17 (aka Equations County boundary New Vienna Road) North Fork Confluence with Approximately 0.5 Iowa AE w/ Maquoketa North Fork miles upstream of Regional Field Survey 07/1992 Floodway River Tributary Maquoketa River Oak Street Equations Confluence with Just downstream Iowa Slope -area AE w/ Sherrill Creek Little Maquoketa of Hochrein Road Regional method 07/1992 Floodway River Equations South Fork Confluence with Approximately 0.1 Iowa Slope-area AE w/ Catfish Creek Catfish Creek miles upstream of Regional method 07/1992 Floodway Cousins Road Equations Approximately 0.4 Confluence with miles upstream of Couler Valley County Hwy Y14 Creek (aka Kennedy Road) Log- Union Park Hollow Creek Pearson Slope -area method 07/1992 AE w/ Floodway Approximately 0.8 miles Approximately 1.3 Type III upstream of miles upstream of County Hwy Y14 County Hwy Y14 (aka Kennedy (aka Kennedy Rd) Road) .X Table 13: Summary of Hydrologic and Hydraulic Analyses (continued) Flooding Source Study Limits Downstream Limit Upstream Limit Hydrologic Model or Method Used Hydraulic Model or Method Used Date Analyses Completed Flood Zone on FIRM Special Considerations For streams studied by approximate methods, the peak flood discharges were computed for the 10-, 2-, 1- and 0.2- percent -annual -chance storm events using hydrologic analyses All Downstream limit Upstream limit of HEC RAS recommended by the Iowa Department approximate of study for study for Regression 3.1.1 and 02/04/2014 A of Natural Resources (IDNR) and the flooding approximate approximate study Equations higher Iowa Department of Transportation. This study reaches reaches hydrologic analysis method includes use of gage information and USGS regression equations. For additional information on the hydrologic analyses please refer to the Technical Support Data Notebook on the MIP 41 Table 14: Roughness Coefficients Flooding Source Channel "n" Overbank "n" Bear Creek Bloody Run 0.04-0.04 0.03-0.05 Catfish Creek 0.03-0.04 0.04-0.07 Cloie Branch 0.03-0.04 0.04-0.07 Couler Valley Creek 0.03-0.05 0.03-0.10 Couler Valley Creek Tributary 0.04-0.04 0.03-0.06 Durion Creek 0.03-0.04 0.03-0.06 Granger Creek 0.03-0.04 0.03-0.07 Hewitt Creek 0.04-0.07 0.05-0.10 Hewitt Creek Tributary 0.02-0.08 0.03-0.13 Little Maquoketa River 0.03-0.05 0.03-0.08 Middle Fork Catfish Creek 0.04-0.05 0.07-0.10 Mississippi River 0.02-0.03 0.03-0.12 North Fork Catfish Creek North Fork Little Maquoketa River 0.03-0.04 0.04-0.07 North Fork Little Maquoketa River Tributary 0.03-0.05 0.03-0.08 North Fork Maquoketa River 0.03-0.06 0.03-0.11 North Fork Maquoketa River Tributary 0.03-0.06 0.03-0.05 Sherrill Creek 0.04-0.05 0.04-0.08 South Fork Catfish Creek 0.04-0.05 0.07-0.09 Union Park Hollow Creek 0.04-0.05 0.03-0.07 All approximate flooding 0.03-0.05 0.02-0.15 *Data not available 5.3 Coastal Analyses This section is not applicable to this Flood Risk Project. Table 15: Summary of Coastal Analyses [Not Applicable to this Flood Risk Project] 5.3.1 Total Stillwater Elevations This section is not applicable to this Flood Risk Project. Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas [Not Applicable to this Flood Risk Project] 42 Table 16: Tide Gage Analysis Specifics [Not Applicable to this Flood Risk Project] 5.3.2 Waves This section is not applicable to this Flood Risk Project. 5.3.3 Coastal Erosion This section is not applicable to this Flood Risk Project. 5.3.4 Wave Hazard Analyses This section is not applicable to this Flood Risk Project. Table 17: Coastal Transect Parameters [Not Applicable to this Flood Risk Project] Figure 9: Transect Location Map [Not Applicable in this FIS Report] 5.4 Alluvial Fan Analyses This section is not applicable to this Flood Risk Project. Table 18: Summary of Alluvial Fan Analyses [Not Applicable to this Flood Risk Project] Table 19: Results of Alluvial Fan Analyses [Not Applicable to this Flood Risk Project] SECTION 6.0 — MAPPING METHODS 6.1 Vertical and Horizontal Control All FIS Reports and FIRMS are referenced to a specific vertical datum. The vertical datum provides a starting point against which flood, ground, and structure elevations can be referenced and compared. Until recently, the standard vertical datum used for newly created or revised FIS Reports and FIRMs was the National Geodetic Vertical Datum of 1929 (NGVD29). With the completion of the North American Vertical Datum of 1988 (NAVD88), many FIS Reports and FIRMS are now prepared using NAVD88 as the referenced vertical datum. Flood elevations shown in this FIS Report and on the FIRMS are referenced to NAVD88. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between NGVD29 and NAVD88 or other datum conversion, please visit the National Geodetic Survey website at www.ngs.noaa.gov. Temporary vertical monuments are often established during the preparation of a flood hazard analysis for the purpose of establishing local vertical control. Although these monuments are not shown on the FIRM, they may be found in the archived project documentation associated with the 43 FIS Report and the FIRMS for this community. Interested individuals may contact FEMA to access these data. To obtain current elevation, description, and/or location information for benchmarks in the area, please visit the NGS website at www.ngs.noaa.gov. The datum conversion locations and values that were calculated for Dubuque County are provided in Table 20. Table 20: Countywide Vertical Datum Conversion [Not Applicable to this Flood Risk Project] Table 21: Stream -by -Stream Vertical Datum Conversion [Not Applicable to this Flood Risk Project] 6.2 Base Map The FIRMs and FIS Report for this project have been produced in a digital format. The flood hazard information was converted to a Geographic Information System (GIS) format that meets FEMA's FIRM database specifications and geographic information standards. This information is provided in a digital format so that it can be incorporated into a local GIS and be accessed more easily by the community. The FIRM Database includes most of the tabular information contained in the FIS Report in such a way that the data can be associated with pertinent spatial features. For example, the information contained in the Floodway Data table and Flood Profiles can be linked to the cross sections that are shown on the FIRMs. Additional information about the FIRM Database and its contents can be found in FEMA's Guidelines and Standards for Flood Risk Analysis and Mapping, www.fema.gov/flood-mqps/guidance-partners/guidelines-standards. Base map information shown on the FIRM was derived from the sources described in Table 22. Table 22: Base Map Sources Data Data Data Type Data Provider Date Scale Data Description U.S. Department of City Commerce, U.S. 2010 1:24,000 City boundaries for the State of Boundaries Census Bureau, Iowa. Geography Division Iowa Department of County Natural Resources - 1990 1:24,000 County boundaries for the State of Boundaries Iowa Geological Iowa. Survey Digital Iowa Department of 2009 1:4,800 Base Imagery Orthophoto Natural Resources Iowa Department of Location and attributes for flood General Natural Resources - 2014 1:24,000 control structures shown on the Structures Geological and Water flood profiles and FIRM. Survey 44 Table 22: Base Map Sources (continued) Data Data Data Type Data Provider Date Scale Data Description U. S. Department of Location and attributes of sections, HUC-8 Agriculture, Natural 2008 1:24,000 townships, and ranges on the Subbasins Resources FIRM. Conservation Service PLSS Areas Iowa Department of 1998 1:24,000 PLSS data were digitized from Natural Resources USGS quadrangles Transportation Iowa Department of Location and attributes for roads, Features Transportation 2010 1:5,000 railroads, and other transportation features shown on the FIRM. 6.3 Floodplain and Floodway Delineation The FIRM shows tints, screens, and symbols to indicate floodplains and floodways as well as the locations of selected cross sections used in the hydraulic analyses and floodway computations. For riverine flooding sources, the mapped floodplain boundaries shown on the FIRM have been delineated using the flood elevations determined at each cross section; between cross sections, the boundaries were interpolated using the topographic elevation data described in Table 23. In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the 1 % annual chance floodplain boundary has been shown. Small areas within the floodplain boundaries may lie above the flood elevations but cannot be shown due to limitations of the map scale and/or lack of detailed topographic data. The floodway widths presented in this FIS Report and on the FIRM were computed for certain stream segments on the basis of equal conveyance reduction from each side of the floodplain. Floodway widths were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. Table 2 indicates the flooding sources for which floodways have been determined. The results of the floodway computations for those flooding sources have been tabulated for selected cross sections and are shown in Table 24, "Floodway Data." Table 23: Summary of Topographic Elevation Data used in Mapping Flooding Source for Topographic Elevation Data Horizontal Community Source Description Vertical Accuracy Accuracy Citation 18.5cm Dubuque Light Detection and (bare earth) / County All Sources Ranging data 37cm (dense +/- 1 meter IDNR 2014a (LiDAR) vegetation) BFEs shown at cross sections on the FIRM represent the 1 % annual chance water surface elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report. Rounded whole - foot elevations may be shown on the FIRM in coastal areas, areas of ponding, and other areas with static base flood elevations. 45 Table 24: Floodway Data FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) BEAR CREEK A 0.25 680 4,330 2.7 936.9 933.72 934.42 0.7 B 0.53 460 2,880 4.1 937.1 935.52 936.42 0.9 C 0.75 200 1,450 8.1 937.4 937.02 937.72 0.7 D 0.89 1,030 7,050 1.7 939.4 939.4 940.4 1.0 E 1.10 820 5,910 2.0 939.6 939.6 940.6 1.0 F 1.30 670 5,350 2.2 940.4 940.4 941.3 0.9 G 1.60 855 3,510 3.3 945.0 945.0 945.1 0.1 H 1.77 515 4,400 2.7 947.4 947.4 947.6 0.2 'MILES ABOVE CONFLUENCE WITH NORTH FORK MAQUOKETA RIVER 2ELEVATION COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM NORTH FORK MAQUOKETA RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA BEAR CREEK 46 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) BLOODY RUN A 1,890 290 1,354 4.0 621.7 615.82 616.82 1.0 B 3,890 224 1,211 4.4 621.7 619.32 620.32 1.0 C 6,140 315 1,029 5.2 623.5 623.5 624.5 1.0 D 7,165 239 910 5.9 626.6 626.6 627.6 1.0 E 8,890 84 652 8.2 632.6 632.6 633.6 1.0 FEET ABOVE CONFLUENCE WITH LITTLE MAQUOKETA RIVER 'ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECTS FROM LITTLE MAQUOKETA RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA BLOODY RUN 47 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) CATFISH CREEK A 100 172 2,145 9.1 609.4 598.02 598.92 0.9 B 570 226 1,281 15.2 609.4 598.82 598.92 0.1 C 1,600 120 2,086 9.3 609.4 606.62 606.62 0.0 D 1,855 120 1,790 10.9 609.4 606.62 606.62 0.0 E 4,050 168 2,454 7.9 610.1 610.1 610.8 0.7 F 5,780 241 3,540 5.5 612.0 612.0 612.9 0.9 G 7,960 638 8,044 2.4 613.6 613.6 614.6 1.0 H 8,870 213 2,619 7.4 613.6 613.6 614.6 1.0 1 11,800 470 5,653 3.4 616.7 616.7 617.6 0.9 1 15,065 435 4,492 2.6 622.4 622.4 623.2 0.8 K 17,375 590 5,446 2.2 626.1 626.1 626.8 0.7 L 25,215 53 592 14.8 645.4 645.4 645.4 0.0 M 28,095 190 1,598 5.5 657.3 657.3 658.2 0.9 N 30,155 188 1,117 7.8 662.2 662.2 662.6 0.4 O 33,665 298 1,538 5.7 670.0 670.0 670.9 0.9 P 36,535 138 1,012 8.6 677.2 677.2 677.9 0.7 Q 39,015 183 1,087 8.1 685.4 685.4 686.3 0.9 R 41,685 191 1,217 7.2 693.5 693.5 694.4 0.9 'FEET ABOVE CONFLUENCE WITH MISSISSIPPI RIVER 2ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM MISSISSIPPI RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA CATFISH CREEK 48 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) CLOIE BRANCH A 630 315 2,462 2.2 635.4 632.52 633.52 1.0 B 2,085 182 1,223 4.4 635.4 633.12 634.12 1.0 C 4,005 50 403 13.3 641.0 641.0 641.8 0.8 D 5,695 132 833 6.4 650.3 650.3 651.3 1.0 E 8,015 182 660 7.6 659.8 659.8 659.8 0.0 F 11,505 103 464 10.8 679.9 679.9 680.9 1.0 G 14,430 451 807 6.2 695.7 695.7 695.7 0.0 'FEET ABOVE CONFLUENCE WITH LITLE MAQUOKETA RIVER 'ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM LITTLE MAQUOKETA RIVER WFEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA m DUBUQUE COUNTY, IA AND INCORPORATED AREAS CLOIE BRANCH 49 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) COULER VALLEY CREEK A 830 750 1,740 1.4 622.3 611.52 612.5 1.0 B 1,550 240 802 3.1 622.3 615.92 615.9 0.0 C 3,000 280 2,043 1.0 622.3 617.82 618.3 0.5 D 3,550 310 1,670 1.2 622.3 617.82 618.6 0.8 E 3,880 295 1,627 1.2 622.3 617.92 618.7 0.8 F 4,410 260 1,174 1.7 622.3 618.02 618.9 0.9 G 4,820 270 1,030 1.9 622.3 618.22 619.1 0.9 H 5,250 300 1,508 1.3 622.3 618.42 619.4 1.0 1 6,900 260 1,413 1.4 622.3 619.52 620.4 0.9 J 7,600 260 891 2.3 622.3 619.62 620.6 1.0 K 9,810 160 1,009 1.4 626.4 626.4 627.0 0.6 L 11,100 170 770 1.8 626.5 626.5 627.5 1.0 'FEET ABOVE CONFLUENCE WITH LITTLE MAQUOKETA RIVER 'ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM LITTLE MAQUOKETA RIVER WFEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA DUBUQUE COUNTY, IA AND INCORPORATED AREAS COULER VALLEY CREEK 50 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) COULER VALLEY CREEK TRIBUTARY A 354 137 937 1.3 622.3 617.12 618.12 1.0 B 930 50 116 10.6 622.3 621.82 622.82 1.0 C 1550 90 97 12.7 638.1 638.1 638.9 0.8 'FEET ABOVE CONFLUENCE WITH COULER VALLEY CREEK 'ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM LITTLE MAOUOKETA RIVER WFEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA DUBUQUE COUNTY, IA AND INCORPORATED AREAS COULER VALLEY CREEK TRIBUTARY 51 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) DURION CREEK AZ 0 269 1,626 3.4 896.4 896.4 897.4 1.0 B 1,730 171 794 6.9 899.2 899.2 900.2 1.0 C 3,742 153 736 7.0 906.1 906.1 907.1 1.0 D 3,813 182 970 5.3 907.7 907.7 908.7 1.0 E 4,073 121 982 5.2 909.5 909.5 910.5 1.0 F 6,200 89 560 7.4 913.3 913.3 914.3 1.0 G 9,290 134 739 5.6 919.4 919.4 920.4 1.0 H 10,990 95 366 11.3 927.1 927.1 927.1 0.0 'FEET ABOVE A POINT APPROXIMATELY 73 FEET DOWNSTREAM OF DUBUQUE / DELAWARE COUNTY BOUNDARY 'CROSS SECTION LOCATED OUTSIDE DUBUQUE COUNTY FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA DURION CREEK 52 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) GRANGER CREEK A 250 267 1,212 6.6 611.8 602.42 603.42 1.0 B 2,110 204 1,430 5.6 611.8 607.42 608.42 1.0 C 4,700 162 1,380 5.8 612.9 612.9 613.9 1.0 D 4,975 195 1,612 4.5 615.4 615.4 616.4 1.0 E 6,860 154 921 7.9 622.3 622.3 623.3 1.0 F 9,000 74 582 12.5 637.9 637.9 638.9 1.0 G 11,320 138 828 8.8 654.1 654.1 655.1 1.0 H 13,656 142 1,033 7.1 666.1 666.1 667.1 1.0 1 14,865 268 1,925 3.8 673.5 673.5 674.5 1.0 J 15,396 115 789 8.1 674.1 674.1 675.1 1.0 K 16,900 103 526 12.1 680.6 680.6 681.6 1.0 L 20,120 187 957 6.7 693.1 693.1 694.1 1.0 M 21,810 90 573 11.1 701.0 701.0 702.0 1.0 'FEET ABOVE CONFLUENCE WITH CATFISH CREEK 2ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM CATFISH CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA GRANGER CREEK 53 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) HEWITT CREEK A 1,848 280 2,240 5.2 945.1 945.1 946.1 1.0 B 2,587 1,000 7,910 1.5 946.9 946.9 947.9 1.0 C 3,485 300 2,016 5.1 947.3 947.3 948.1 0.8 D 4,699 215 2,295 4.4 949.7 949.7 950.6 0.9 E 7,814 435 2,198 4.6 954.3 954.3 955.1 0.8 F 9,770 104 1,530 6.7 960.2 960.2 961.0 0.8 G 12,870 571 3,436 3.0 967.2 967.2 967.9 0.7 H 14,470 650 3,385 3.0 969.0 969.0 969.8 0.8 I 15,570 650 2,951 3.5 970.4 970.4 971.4 1.0 J 16,870 550 2,487 4.1 973.2 973.2 974.1 0.9 'FEET ABOVE CONFLUENCE WITH NORTH FORK MAQUOKETA RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA HEWITT CREEK 54 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) HEWITT CREEK TRIBUTARY A 950 90 525 10.5 946.9 944.12 945.12 1.0 B 1,109 110 901 6.1 948.0 948.0 948.8 0.8 C 3,326 405 2,775 2.0 955.0 955.0 956.0 1.0 D 7,300 145 684 8.0 969.6 969.6 970.5 0.9 E 9,100 137 1,482 3.7 980.1 980.1 981.1 1.0 'FEET ABOVE CONFLUENCE WITH HEWITT CREEK 2ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM HEWITT CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA HEWITT CREEK TRIBUTARY 55 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) LITTLE MAQUOKETA RIVER A 117 1,036 9,551 4.2 613.9 613.9 614.7 0.8 B 5,685 1,111 10,841 3.7 617.5 617.5 618.5 1.0 C 9,243 982 9,658 4.1 618.8 618.8 619.8 1.0 D 13,953 770 6,814 5.8 621.1 621.1 622.0 0.9 E 15,933 668 6,365 6.3 623.1 623.1 624.1 1.0 F 17,043 204 2,902 13.7 624.1 624.1 625.1 1.0 G 17,459 333 5,265 7.6 626.7 626.7 627.7 1.0 H 17,763 164 3,144 12.7 626.7 626.7 627.7 1.0 1 19,003 1,165 16,373 2.4 629.6 629.6 630.6 1.0 J 20,283 1,388 19,394 2.1 629.7 629.7 630.7 1.0 K 21,683 1,325 17,770 2.2 629.8 629.8 630.8 1.0 L 22,983 1,126 15,378 2.6 629.9 629.9 630.9 1.0 M 25,533 944 11,250 3.5 630.3 630.3 631.3 1.0 N 27,535 1,394 13,612 2.9 631.2 631.2 632.2 1.0 O 27,652 1,369 12,883 3.1 631.4 631.4 632.4 1.0 P 31,615 614 6,543 6.1 635.4 635.4 636.4 1.0 Q 31,830 631 6,853 5.3 636.8 636.8 637.8 1.0 R 34,023 700 9,907 3.7 639.2 639.2 640.2 1.0 S 37,313 668 7,432 4.9 642.1 642.1 643.1 1.0 T 39,393 615 8,056 4.5 645.1 645.1 646.1 1.0 U 41,165 598 6,607 5.5 647.4 647.4 648.4 1.0 V 41,381 671 6,567 5.6 648.2 648.2 649.2 1.0 W 42,533 455 4,603 2.0 649.4 649.4 650.4 1.0 X 44,153 317 2,777 3.3 649.8 649.8 650.8 1.0 Y 1 46,713 1 207 1 1,423 1 6.4 1 652.0 1 652.0 1 653.0 1 1.0 'FEET ABOVE OLD CHICAGO, MILWAUKEE, ST. PAUL, AND PACIFIC RAILROAD FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA LITTLE MAQUOKETA RIVER 56 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) LITTLE MAQUOKETA RIVER Z 47,650 90 699 13.1 654.9 654.9 655.7 0.8 AA 47,766 111 1,072 8.6 657.2 657.2 658.2 1.0 AB 49,795 300 3,824 2.4 658.5 658.5 659.5 1.0 AC 50,011 289 3,510 2.6 658.6 658.6 659.6 1.0 AD 50,808 404 926 9.9 663.1 663.1 664.1 1.0 AE 52,233 232 1,578 5.8 669.2 669.2 670.2 1.0 AF 54,453 103 915 10.0 675.0 675.0 675.6 0.6 AG 56,233 257 1,594 5.8 679.0 679.0 680.0 1.0 AH 59,083 150 1,119 8.2 684.8 684.8 685.8 1.0 Al 61,338 242 1,704 5.4 688.9 688.9 689.9 1.0 AJ 63,963 166 1,070 8.6 694.1 694.1 695.1 1.0 AK 65,148 130 1,032 8.9 697.8 697.8 698.8 1.0 'FEET ABOVE OLD CHICAGO, MILWAUKEE, ST. PAUL, AND PACIFIC RAILROAD FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA LITTLE MAQUOKETA RIVER 57 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) MIDDLE FORK CATFISH CREEK A 1,020 365 2,844 2.4 620.3 620.3 621.3 1.0 B 5,130 100 10,001 6.8 638.7 638.7 638.9 0.2 C 12,190 140 2,237 3.0 669.3 669.3 670.1 0.8 D 16,510 360 922 7.4 686.4 686.4 687.1 0.7 E 25,300 100 680 7.8 724.0 724.0 724.9 0.9 F 34,710 120 1,296 3.8 761.3 761.3 761.9 0.6 G 40,180 250 1,248 3.8 781.9 781.9 782.4 0.5 H 41,480 317 602 7.9 785.3 785.3 786.0 0.7 1 43,270 145 465 10.3 792.2 792.2 792.2 0.0 'FEET ABOVE CONFLUENCE WITH CATFISH CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA MIDDLE FORK CATFISH CREEK 58 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY BASE FLOOD WATER SURFACE ELEVATION FEET SECTION MEAN WITHOUT WITH WIDTH AREA VELOCITY REGULATORY CROSS SECTION DISTANCE FLOODWAY FLOODWAY DIFFERENCE (FEET) (SQUARE (FEET PER (NAVD) (NAVD) (NAVD) FEET SECOND MISSISSIPPI RIVER A 568.40 6,006/1,3852 111,027 2.5 606.2 606.2 606.5 0.3 B 570.60 5,912/3652 107,788 2.5 607.0 607.0 607.3 0.3 C 572.30 6,783/4,8452 125,302 2.2 607.6 607.6 607.9 0.3 D 574.70 5,437/1,5002 96,121 2.8 608.3 608.3 608.5 0.2 E 576.60 5,091/5902 83,374 3.3 609.2 609.2 609.4 0.3 F 578.60 3,914/8232 79,269 3.5 610.0 610.0 610.3 0.2 G 580.50 1,969/1,0452 75,582 3.6 610.6 610.6 610.9 0.2 H 582.60 2,692/3802 75,211 3.6 611.1 611.1 611.5 0.3 1 585.00 7,541/4,9752 140,521 2.0 611.9 611.9 612.5 0.5 J 587.50 8,256/1,7202 165,353 1.7 612.2 612.2 612.6 0.4 K 588.50 9,638/2,6252 170,962 1.6 612.3 612.3 612.8 0.5 L 590.60 7,032/1,2602 123,280 2.2 612.7 612.7 613.1 0.4 M 592.50 8,871/8002 138,022 2.0 613.2 613.2 613.5 0.4 N 594.40 7,523/8752 116,185 2.4 613.6 613.6 613.9 0.3 O 596.20 7,126/6052 110,834 2.5 614.2 614.2 614.5 0.4 P 598.00 6,558/7052 102,044 2.7 614.7 614.7 615.0 0.3 Q 599.90 6,954/6752 113,592 2.4 615.4 615.4 615.7 0.3 1 Miles above conflunce with Ohio River 2Total Width/Width Within County Boundary D FEDERAL EMERGENCY MANAGEMENT AGENCY FLOODWAY DATA W DUBUQUE COUNTY, IA m � AND INCORPORATED AREAS MISSISSIPPI RIVER 59 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) NORTH FORK CATFISH CREEK A 4,040 150 593 6.1 719.1 719.1 719.3 0.2 B 5,050 150 509 6.3 729.2 729.2 729.5 0.3 C 8,750 150 813 2.6 760.7 760.7 761.0 0.3 'FEET ABOVE CONFLUENCE WITH MIDDLE FORK CATFISH CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA NORTH FORK CATFISH CREEK Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) NORTH FORK LITTLE MAQUOKETA RIVER A 538 494 3872 7.2 648.5 645.32 646.32 1.0 B 2,469 470 4081 6.8 648.5 648.12 649.12 1.0 C 5,527 503 4560 6.1 652.7 652.7 653.7 1.0 D 7,444 616 5144 5.4 655.1 655.1 656.1 1.0 E 10,404 457 4086 6.8 658.9 658.9 659.9 1.0 F 12,124 456 2336 3.3 660.8 660.8 661.8 1.0 'FEET ABOVE CONFLUENCE WITH LITTLE MAQUOKETA RIVER 2ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM LITTLE MAQUOKETA RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA NORTH FORK LITTLE MAQUOKETA RIVER 61 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) NORTH FORK LITTLE MAQUOKETA RIVER TRIBUTARY A 166 52 535 9.0 652.7 650.42 651.42 1.0 B 1,968 61 401 12.0 658.0 658.0 659.0 1.0 C 4,228 157 559 8.6 672.8 672.8 673.8 1.0 D 6,066 67 596 8.1 688.5 688.5 689.5 1.0 E 7,386 57 345 13.9 696.3 696.3 696.9 0.6 F 7,510 108 708 6.8 699.3 699.3 700.3 1.0 G 9,430 47 308 14.5 720.3 720.3 720.3 0.0 H 9,606 360 3,169 1.4 729.3 729.3 730.3 1.0 1 10,888 286 1815 2.5 729.6 729.6 730.6 1.0 1 FEET ABOVE CONFLUENCE WITH NORTH FORK LITTLE MAQUOKETA RIVER 2ELEVATIONS WITHOUT CONSIDERING BACKWATER EFFECT FROM NORTH FORK LITTLE MAQUOKETA RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA NORTH FORK LITTLE MAQUOKETA RIVER TRIBUTARY 62 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) NORTH FORK MAQUOKETA RIVER A 0.00 229/1202 3,657 5.2 810.3 810.3 811.3 1.0 B 3.00 409/2102 5,913 3.2 811.4 811.4 812.4 1.0 C 7.80 1,300 13,436 1.4 812.5 812.5 813.4 0.9 D 9.25 152 2,197 8.7 812.8 812.8 813.8 1.0 E 9.80 176 1,405 13.6 816.6 816.6 816.6 0.0 F 10.50 650 4,759 4.0 820.1 820.1 820.2 0.1 G 12.70 845 7,031 2.7 821.4 821.4 822.4 1.0 H 16.00 973 6,127 3.0 822.7 822.7 823.6 0.9 1 20.00 367 2,146 8.6 825.8 825.8 826.5 0.7 J 21.95 180 2,300 8.0 829.9 829.9 830.4 0.5 K 25.00 172 2,084 8.8 832.4 832.4 833.4 1.0 L 136.16 337/2742 4,336 3.7 926.3 926.3 927.2 0.9 M 137.30 281 3,721 4.3 927.5 927.5 928.2 0.7 N 139.90 332 4,443 3.6 929.8 929.8 930.5 0.7 O 141.78 282 3,428 4.6 931.6 931.6 932.3 0.7 P 142.75 350 4,965 3.2 932.5 932.5 933.2 0.7 Q 144.45 670 7,657 2.1 933.8 933.8 934.5 0.7 R 145.61 754 6,060 2.6 934.4 934.4 935.1 0.7 S 147.15 480/3702 6,142 2.6 936.2 936.2 936.9 0.7 T 148.25 1,175 12,333 1.3 936.6 936.6 937.5 0.9 U 149.35 1,395 13,640 1.2 936.8 936.8 937.7 0.9 V 150.70 880 7,785 1.6 937.0 937.0 937.9 0.9 W 151.68 250 2,639 4.8 937.2 937.2 938.1 0.9 X 152.55 220 2,096 6.0 938.8 938.8 939.4 0.6 y 153.78 460 4,125 3.1 940.4 940.4 941.2 0.8 Z 1 155.78 1 400 1 3,178 1 4.0 1 942.5 1 942.5 1 943.3 1 0.8 'THOUSANDS OF FEET ABOVE DUBUQUE/JONES COUNTY BOUNDARY 2WIDTH/WIDTH WITHIN DUBUQUE COUNTY FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA NORTH FORK MAQUOKETA RIVER 63 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) NORTH FORK MAQUOKETA RIVER AA 157.04 600 4,917 2.6 943.8 943.8 944.5 0.7 AB 158.30 975 6,133 2.1 944.7 944.7 945.4 0.7 AC 159.80 400 1,936 4.7 945.6 945.6 946.3 0.7 AD 161.03 815 3,977 2.3 947.2 947.2 947.8 0.6 AE 162.90 1,079 6,050 1.5 947.9 947.9 948.6 0.7 AF 164.15 375 2,972 3.1 948.7 948.7 949.5 0.8 AG 167.05 800 3,193 2.9 953.0 953.0 953.6 0.6 AH 167.75 800 3,515 2.6 955.8 955.8 956.0 0.2 Al 168.90 969 4,253 2.2 956.4 956.4 956.9 0.5 AJ 170.30 331 1,890 4.9 956.6 956.6 957.3 0.7 AK 172.70 481 2,203 4.2 960.4 960.4 960.5 0.1 AL 174.15 119 1,429 6.4 963.1 963.1 963.1 0.0 AM 175.43 159 1,442 6.4 966.5 966.5 966.7 0.2 AN 177.70 300 2,639 3.5 972.3 972.3 972.8 0.5 AO 179.17 240 1,848 5.0 975.8 975.8 976.2 0.4 AP 180.85 194 1,650 5.1 978.6 978.6 979.3 0.7 AQ 184.00 440 2,984 2.8 980.8 980.8 981.4 0.6 AR 186.40 306/2802 2,090 4.0 982.0 982.0 982.6 0.6 AS 186.65 477 2,720 3.1 984.6 984.6 984.9 0.3 AT 189.00 249 1,933 4.3 986.8 986.8 987.2 0.4 AU 190.83 325 2,393 3.0 987.8 987.8 988.3 0.5 AV 192.85 154 1,007 7.2 988.7 988.7 989.3 0.6 AW 193.58 348 2,236 3.3 990.4 990.4 990.9 0.5 AX 194.12 250 1,031 7.1 990.5 990.5 991.1 0.6 AY 195.84 210 1,985 3.7 998.3 998.3 998.4 0.1 AZ 198.40 372 2,193 3.3 999.7 999.7 1,000.0 0.3 'THOUSANDS OF FEET ABOVE DUBUQUE/JONES COUNTY BOUNDARY 'WIDTH/WIDTH WITHIN DUBUQUE COUNTY FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA NORTH FORK MAQUOKETA RIVER 64 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) NORTH FORK MAQUOKETA RIVER BA 200.67 710 3,203 2.3 1,000.6 1,000.6 1,001.0 0.4 BB 203.20 220 1,194 6.1 1,004.3 1,004.3 1,004.6 0.3 BC 207.60 328 1,843 3.9 1,010.8 1,010.8 1,011.5 0.7 'THOUSANDS OF FEET ABOVE DUBUQUE/JONES COUNTY BOUNDARY FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA NORTH FORK MAQUOKETA RIVER 65 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) NORTH FORK MAQUOKETA RIVER TRIBUTARY A 1,510 189 506 5.2 936.3 932.32 932.32 0.0 B 1,800 160 563 4.6 936.3 933.82 933.82 0.0 C 2,120 258 1,155 2.3 938.9 938.9 938.9 0.0 D 2,515 144 680 3.8 938.9 938.9 938.9 0.0 E 2,980 157 536 4.9 940.2 940.2 940.2 0.0 F 6,540 180 324 8.1 964.6 964.6 964.8 0.2 G 7,000 153 402 6.5 967.3 967.3 968.1 0.8 H 8,620 150 528 4.9 975.2 975.2 975.7 0.5 1 9,350 148 311 8.4 979.4 979.4 979.4 0.0 'FEET ABOVE COUNFLUENCE WITH NORTH FORK MAQUOKETA RIVER 2ELEVATION COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM NORTH FORK MAQUOKETA RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA NORTH FORK MAQUOKETA RIVER TRIBUTARY :• Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) SHERRILL CREEK A 2,800 171 817 5.1 648.6 647.22 648.22 1.0 B 4,480 140 910 4.6 652.3 652.3 653.3 1.0 'FEET ABOVE CONFLUENCE WITH LITTLE MAQUOKETA RIVER 2ELEVATION WITHOUT CONSIDERING BACKWATER EFFECT FROM LITTLE MAQUOKETA RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS Iy11#101117%\ab7_Afi_1 SHERRILL CREEK 67 Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) SOUTH FORK CATFISH CREEK A 1,085 210 2,216 3.5 626.5 626.5 627.1 0.6 B 4,545 220 1,879 4.2 640.5 640.5 641.0 0.5 C 6,145 250 600 13.0 645.9 645.9 645.9 0.0 D 8,505 150 757 10.3 655.1 655.1 655.9 0.8 E 15,745 160 616 11.5 676.9 676.9 677.5 0.6 F 19,585 185 761 9.3 692.9 692.9 693.5 0.6 G 22,785 120 722 9.8 704.3 704.3 704.9 0.6 H 24,005 200 1,124 6.3 713.9 713.9 713.9 0.0 1 24,795 150 616 11.5 714.7 714.7 714.7 0.0 J 27,335 200 833 8.5 725.5 725.5 725.8 0.3 K 29,395 180 708 10.0 732.7 732.7 733.3 0.6 L 33,975 250 1,041 6.8 744.8 744.8 745.6 0.8 M 35,975 200 662 10.7 749.5 749.5 750.2 0.7 N 38,645 260 907 6.7 760.6 760.6 760.7 0.1 O 39,470 300 981 6.2 766.5 766.5 766.9 0.4 P 40,180 150 627 9.7 767.0 767.0 767.1 0.1 'FEET ABOVE CONFLUENCE WITH CATFISH CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA SOUTH FORK CATFISH CREEK Table 24: Floodway Data (continued) FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD WATER SURFACE ELEVATION SECTION MEAN WITHOUT WITH WIDTH REGULATORY INCREASE CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOODWAY (FEET) (SQ.FEET) (FEET/SEC.) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET) UNION PARK HOLLOW A 4,740 27 98 13.2 665.8 665.8 666.2 0.4 B 8,360 30 117 10.0 725.0 725.0 726.0 1.0 C 10,400 43 155 6.2 758.8 758.8 759.8 1.0 'FEET ABOVE CONFLUENCE WITH COULER VALLEY CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY DUBUQUE COUNTY, IA AND INCORPORATED AREAS FLOODWAY DATA UNION PARK HOLLOW Table 25: Flood Hazard and Non -Encroachment Data for Selected Streams [Not Applicable to this Flood Risk Project] 6.4 Coastal Flood Hazard Mapping This section is not applicable to this Flood Risk Project. Table 26: Summary of Coastal Transect Mapping Considerations [Not Applicable to this Flood Risk Project] 6.5 FIRM Revisions This FIS Report and the FIRM are based on the most up-to-date information available to FEMA at the time of its publication; however, flood hazard conditions change over time. Communities or private parties may request flood map revisions at any time. Certain types of requests require submission of supporting data. FEMA may also initiate a revision. Revisions to FIS projects may take several forms, including Letters of Map Amendment (LOMAs), Letters of Map Revision Based on Fill (LOMR-Fs), Letters of Map Revision (LOMRs) (referred to collectively as Letters of Map Change (LOMCs)), Physical Map Revisions (PMRs), and FEMA-contracted restudies. These types of revisions are further described below. Some of these types of revisions do not result in the republishing of the FIS Report. To assure that any user is aware of all revisions, it is advisable to contact the community repository of flood -hazard data (shown in Table 31,"Map Repositories"). 6.5.1 Letters of Map Amendment A LOMA is an official revision by letter to an effective NFIP map. A LOMA results from an administrative process that involves the review of scientific or technical data submitted by the owner or lessee of property who believes the property has incorrectly been included in a designated SFHA. A LOMA amends the currently effective FEMA map and establishes that a specific property is not located in a SFHA. To obtain an application for a LOMA, visit www.fema.gov/flood-maps/change-your-flood-zone and download the form "MT-1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill". Visit the "Flood Map - Related Fees" section to determine the cost, if any, of applying for a LOMA. FEMA offers a tutorial on how to apply for a LOMA. The LOMA Tutorial Series can be accessed at www.fema.gov/online-tutorials. For more information about how to apply for a LOMA, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627). 6.5.2 Letters of Map Revision Based on Fill A LOMR-F is an official revision by letter to an effective NFIP map. A LOMR-F states FEMA's determination concerning whether a structure or parcel has been elevated on fill above the base flood elevation and is, therefore, excluded from the SFHA. Information about obtaining an application for a LOMR-F can be obtained in the same manner as that for a LOMA, by visiting www.fema.gov/flood-maps/change-your-flood-zone for the "MT-1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill" or by calling the FEMA Map Information eXchange, toll 70 free, at 1-877-FEMA MAP (1-877-336-2627). Fees for applying for a LOMR-F, if any, are listed in the "Flood Map -Related Fees" section. A tutorial for LOMR-F is available at www.fema.gov/online-tutorials. 6.5.3 Letters of Map Revision A LOMR is an official revision to the currently effective FEMA map. It is used to change flood zones, floodplain and floodway delineations, flood elevations and planimetric features. All requests for LOMRs should be made to FEMA through the chief executive officer of the community, since it is the community that must adopt any changes and revisions to the map. If the request for a LOMR is not submitted through the chief executive officer of the community, evidence must be submitted that the community has been notified of the request. To obtain an application for a LOMR, visit w-ww.fema.gov/floodplain-management/letter-mgp- amendment-loma and download the form "MT-2 Application Forms and Instructions for Conditional Letters of Map Revision and Letters of Map Revision". Visit the "Flood Map -Related Fees" section to determine the cost of applying for a LOMR. For more information about how to apply for a LOMR, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1- 877-336-2627) to speak to a Map Specialist. Previously issued mappable LOMCs (including LOMRs) that have been incorporated into the Dubuque County FIRM are listed in Table 27. Table 27: Incorporated Letters of Map Change Case Effective Number Date Flooding Source FIRM Panel(s) 19061 CO238F North Fork Catfish 12-07-2232P 05/31/2013 19061 C0351 F Creek 19061C0352F 6.5.4 Physical Map Revisions PMRs are an official republication of a community's NFIP map to effect changes to base flood elevations, floodplain boundary delineations, regulatory floodways and planimetric features. These changes typically occur as a result of structural works or improvements, annexations resulting in additional flood hazard areas or correction to base flood elevations or SFHAs. The community's chief executive officer must submit scientific and technical data to FEMA to support the request for a PMR. The data will be analyzed, and the map will be revised if warranted. The community is provided with copies of the revised information and is afforded a review period. When the base flood elevations are changed, a 90-day appeal period is provided. A 6-month adoption period for formal approval of the revised map(s) is also provided. For more information about the PMR process, please visit http://www.fema.gov and visit the "Flood Map Revision Processes" section. 6.5.5 Contracted Restudies The NFIP provides for a periodic review and restudy of flood hazards within a given community. FEMA accomplishes this through a national watershed -based mapping needs assessment strategy, known as the Coordinated Needs Management Strategy (CNMS). The CNMS is used by FEMA to assign priorities and allocate funding for new flood hazard analyses used to update the FIS Report 71 and FIRM. The goal of CNMS is to define the validity of the engineering study data within a mapped inventory. The CNMS is used to track the assessment process, document engineering gaps and their resolution, and aid in prioritization for using flood risk as a key factor for areas identified for flood map updates. Visit www.fema.gov to learn more about the CNMS or contact the FEMA Regional Office listed in Section 8 of this FIS Report. 6.5.6 Community Map History The current FIRM presents flooding information for the entire geographic area of Dubuque County. Previously, separate FIRMS, Flood Hazard Boundary Maps (FHBMs) and/or Flood Boundary and Floodway Maps (FBFMs) may have been prepared for the incorporated communities and the unincorporated areas in the county that had identified SFHAs. Current and historical data relating to the maps prepared for the project area are presented in Table 28, "Community Map History." A description of each of the column headings and the source of the date is also listed below. Community Name includes communities falling within the geographic area shown on the FIRM, including those that fall on the boundary line, nonparticipating communities, and communities with maps that have been rescinded. Communities with No Special Flood Hazards are indicated by a footnote. If all maps (FHBM, FBFM, and FIRM) were rescinded for a community, it is not listed in this table unless SFHAs have been identified in this community. Initial Identification Date (First NFIP Map Published) is the date of the first NFIP map that identified flood hazards in the community. If the FHBM has been converted to a FIRM, the initial FHBM date is shown. If the community has never been mapped, the upcoming effective date or "pending" (for Preliminary FIS Reports) is shown. If the community is listed in Table 28but not identified on the map, the community is treated as if it were unmapped. • Initial FHBM Effective Date is the effective date of the first Flood Hazard Boundary Map (FHBM). This date maybe the same date as the Initial NFIP Map Date. • FHBMRevision Date(s)is the date(s) that the FHBM was revised, if applicable. • Initial FIRMEffective Date is the date of the first effective FIRM for the community. This is the first effective date that is shown on the FIRM panel. • FIRMRevision Date(s)is the date(s) the FIRM was revised, if applicable. This is the revised date that is shown on the FIRM panel, if applicable. As countywide studies are completed or revised, each community listed should have its FIRM dates updated accordingly to reflect the date of the countywide study. Once the FIRMs exist in countywide format, as Physical Map Revisions (PMR) of FIRM panels within the county are completed, the FIRM Revision Dates in the table for each community affected by the PMR are updated with the date of the PMR, even if the PMR did not revise all the panels within that community. The initial effective date for the Dubuque County FIRMS in countywide format was October 18, 2011. 72 Table 28: Community Map History Initial Initial FHBM FHBM Initial FIRM FIRM Identification Effective Revision Effective Revision Community Name Date Date Date(s) Date Date(s) City of Asbury2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Balltown' 2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Bankston' 2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Bernard' 2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 11 /19/1976 8/10/2021 City of Cascade 12/17/1973 12/17/1973 4/2/1979 10/18/2011 1/9/1976 10/16/1992 City of Centralia' 2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 8/10/2021 8/19/2013 City of Dubuque 5/15/1970 N/A N/A 5/15/1970 10/18/2011 9/6/1989 10/31 /1975 7/1/1974 Dubuque County 8/10/2021 (Unincorporated 6/17/1977 6/17/1977 N/A 9/1/1983 8/19/2013 Areas) 10/18/2011 6/2/1995 City of Durango 10/17/1978 10/17/1978 N/A 7/16/1981 8/10/2021 10/18/2011 8/10/2021 10/18/2011 City of Dyersville 6/28/1974 6/28/1974 5/14/1976 12/1/1977 6/2/1995 11 /19/1980 City of Epworth2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Farley' 2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Graft 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Holy Cross' 2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Luxemburg2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 8/10/2021 City of New Vienna 8/16/1974 8/16/1974 1/23/1976 10/18/1983 10/18/2011 5/16/1994 City of Peosta2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Rickardsville2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Sageville 11/1/1974 11/1/1974 3/5/1976 6/15/1984 8/10/2021 10/18/2011 City of Sherrill', 2 10/18/2011 N/A N/A 10/18/2011 8/10/2021 City of Worthington 11/1/1974 11/1/1974 N/A 10/18/1983 8/10/2021 10/18/2011 City of Zwingle 11/5/1976 11/5/1976 N/A 10/18/2011 8/10/2021 ' No Special Flood Hazard Areas Identified 2 This community did not have a FIRM prior to the first countywide FIRM for Dubuque County 73 SECTION 7.0 — CONTRACTED STUDIES AND COMMUNITY COORDINATION 7.1 Contracted Studies Table 29 provides a summary of the contracted studies, by flooding source, that are included in this FIS Report. Table 29: Summary of Contracted Studies Included in this FIS Report Work FIS Report Completed Flooding Source Dated Contractor Number Date Affected Communities Bear Creek 10/18/2011 USACE Rock EMW-91-E- July 1992 City of Dyersville Island District 3529 USACE Rock EMW-91-E- City of Sageville, Bloody Run 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) USACE Rock EMW-91-E- City of Dubuque, Catfish Creek 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) Cloie Branch 10/18/2011 USACE Rock EMW-91-E- July 1992 Dubuque County Island District 3529 (Unincorporated Areas) Couler Valley Creek 10/18/2011 USACE Rock EMW-91-E- July 1992 Dubuque County Island District 3529 (Unincorporated Areas) Couler Valley Creek 10/18/2011 USACE Rock EMW-91-E- July 1992 City of Sageville, Dubuque County Tributary Island District 3529 (Unincorporated Areas) USACE Rock EMW-91-E- City of Worthington, Durion Creek 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) USACE Rock EMW-91-E- City of Dubuque, Granger Creek 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) USACE Rock EMW-91-E- City of Dyersville, Hewitt Creek 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) USACE Rock EMW-91-E- City of Dyersville, Hewitt Creek Tributary 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) USACE Rock EMW-91-E- City of Sageville, Little Maquoketa River 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) Middle Fork Catfish 10/18/2011 USACE Rock EMW-91-E- July 1992 City of Dubuque Creek Island District 3529 74 Table 29: Summary of Contracted Studies Included in this FIS Report (continued) Work FIS Report Completed Flooding Source Dated Contractor Number Date Affected Communities USACE Rock Island, St. City of Dubuque, Mississippi River 10/18/2011 Louis, Kansas EMW-2002- 2004 Dubuque County City, Omaha, IA-0114 (Unincorporated Areas) SPaul Districts Mississippi River HSFEHQ-09- City of Dubuque, (Interior Drainage) 8/19/2013 STARR D-0370 March 2012 Dubuque County (Unincorporated Areas) North Fork Catfish 10/18/2011 USACE Rock EMW-91-E- July 1992 City of Dubuque Creek Island District 3529 North Fork Little 10/18/2011 USACE Rock EMW-91-E- July 1992 Dubuque County Maquoketa River Island District 3529 (Unincorporated Areas) North Fork Little USACE Rock EMW-91-E- Dubuque County Maquoketa River 10/18/2011 Island District 3529 July 1992 (Unincorporated Areas) Tributary City of Cascade, Dubuque County (Unincorporated Areas) (U North Fork Maquoketa 10/18/2011 USACE Rock EMW-91-E- July 1992 Dyersville, River Island District 3529 Y of Dubuque County (Unincorporated Areas), City of New Vienna North Fork Maquoketa USACE Rock EMW-91-E- City of Dyersville, River Tributary 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) USACE Rock EMW-91-E- City of Durango, Sherrill Creek 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) South Fork Catfish USACE Rock EMW-91-E- City of Dubuque, Creek 10/18/2011 Island District 3529 July 1992 Dubuque County (Unincorporated Areas) Union Park Hollow 10/18/2011 USACE Rock EMW-91-E- July 1992 City of Sageville, Dubuque County Creek Island District 3529 (Unincorporated Areas) 75 Table 29: Summary of Contracted Studies Included in this FIS Report (continued) Flooding Source FIS Report Dated Contractor Number Work Completed Date Affected Communities City of Asbury, City of Cascade, City of Dubuque, Dubuque County Iowa Flood (Unincorporated Areas), Center and City of Dyersville, All approximate 8/10/2021 IIHR 17ESDLQSR February City of Epworth, City of Graf, flooding Hydroscience ALS-0002 2014 City of Luxemburg, and Engineering City of New Vienna, City of Peosta, City of Rickardsville, City of Sageville, City of Worthington, City of Zwin le 7.2 Community Meetings The dates of the community meetings held for this FIS project and any previous FIS projects are shown in Table 30. These meetings may have previously been referred to by a variety of names (Community Coordination Officer (CCO), Scoping, Discovery, etc.), but all meetings represent opportunities for FEMA, community officials, study contractors, and other invited guests to discuss the planning for and results of the project. 76 Table 30: Community Meetings Community FIS Report Dated Date of Meeting Meeting Type Attended By June 2, 2011 August 25, 2005 Initial Community Consultation Officer FEMA, Black & Veatch, and the communities June 2, 2011 February 23, 2010 Final CommunityConsultation Officer FEMA, Black &Veatch, and the communities Dubuque County, Iowa and Incorporated Areas August 10, 2021 April 12, 2017 Draft Flood Hazard Product Iowa DNR, Stantec, and the communities Review Meeting August 10, 2021 October 17, 2018 Final Community FEMA, Iowa DNR, Atkins, IIW Engineers, Consultation Officer community officials, citizens and the press 77 SECTION 8.0 — ADDITIONAL INFORMATION Information concerning the pertinent data used in the preparation of this FIS Report can be obtained by submitting an order with any required payment to the FEMA Engineering Library. For more information on this process, see http://www.fema.gov. Table 31 is a list of the locations where FIRMS for Dubuque County can be viewed. Please note that the maps at these locations are for reference only and are not for distribution. Also, please note that only the maps for the community listed in the table are available at that particular repository. A user may need to visit another repository to view maps from an adjacent community. Table 31: Map Repositories Community Address City State Zip Code City Hall City of Asbury 5290 Grand Meadow Drive Asbury IA 52002 City Clerk's Office City of Balltown 353 Horseshoe Road Balltown IA 52073 City Clerk's Office City of Bankston 11499 Gun Club Road Epworth IA 52045 City Hall City of Bernard 549 Leffler Street Bernard IA 52032 City Hall City of Cascade 320 1 st Avenue West Cascade IA 52033 City Clerk's Office City of Centralia 16815 Thunder Ridge Drive Peosta IA 52068 City Hall City of Dubuque 50 West 13th Street Dubuque IA 52001 Dubuque County Dubuque County Courthouse (Unincorporated Areas) 720 Central Avenue Dubuque IA 52001 City Hall City of Durango 833 U.S. Highway 52 North Durango IA 52039 City Hall City of Dyersville 340 1st Avenue East Dyersville IA 52040 City Hall City of Epworth 191 Jacoby Drive East Epworth IA 52045 Table 31: Map Repositories (continued) Community Address City State Zip Code City Hall City of Farley 114 First Street North Farley IA 52046 City Clerk's Office City of Graf 10294 Emberwood Drive Dubuque IA 52001 City Hall City of Holy Cross 895 Main Street Holy Cross IA 52053 City Hall City of Luxemburg 202 South Andres Street Luxemburg IA 52056 City Hall City of New Vienna 7271 Columbus Street New Vienna IA 52065 Community Centre City of Peosta 7896 Burds Road Peosta IA 52068 City Hall City of Rickardsville 20494 St. Joseph's Drive Rickardsville IA 52039 City Clerk's Office City of Sageville 31626 Olde Castle Road Dyersville IA 52040 City Hall City of Sherrill 5309 South Mound Road Sherrill IA 52073 City Hall City of Worthington 216 1st Avenue West Worthington IA 52078 City Hall City of Zwingle 80 Walnut Street Zwingle IA 52079 The National Flood Hazard Layer (NFHL) dataset is a compilation of effective FIRM databases and LOMCs. Together they create a GIS data layer for a State or Territory. The NFHL is updated as studies become effective and extracts are made available to the public monthly. NFHL data can be viewed or ordered from the website shown in Table 32. Table 32 contains useful contact information regarding the FIS Report, the FIRM, and other relevant flood hazard and GIS data. In addition, information about the state NFIP Coordinator and GIS Coordinator is shown in this table. At the request of FEMA, each Governor has designated an agency of State or territorial government to coordinate that State's or territory's NFIP activities. These agencies often assist communities in developing and adopting necessary floodplain management measures. State GIS Coordinators are knowledgeable about the availability and location of state and local GIS data in their state. 79 Table 32: Additional Information FEMA and the NFIP FEMA and FEMA www.fema.gov/national-flood-insurance-program-floodhazard- mapping/engineering-library Engineering Library website NFIP website www.fema.gov/national-flood-insurance-program NFHL Dataset http://msc.fema.gov FEMA Region VII 11224 Holmes Road Kansas City, Missouri 64131-3626 Telephone: (816) 283-7003 Other Federal Agencies USGS website http://www.usgs.gov Hydraulic Engineering Center http://www.hec.usace.armV.mil website State Agencies and Organizations State NFIP Coordinator Bill Cappuccio Iowa Department of Natural Resources Wallace State Office Building Des Moines, IA 50319 515-281-8942 FAX 515-281-8895 bill.cappuccio(o.dnr.state.ia.us State GIS Coordinator Patrick Wilke -Brown Iowa Department of Natural Resources Wallace State Office Building Des Moines, IA 50319 515-281-6905 patrick.wilke-brown(o)dnr.iowa.gov SECTION 9.0 - BIBLIOGRAPHY AND REFERENCES Table 33 includes sources used in the preparation of and cited in this FIS Report as well as additional studies that have been conducted in the study area. :1 Table 33: Bibliography and References Citation Publisher/ Publication Title, "Article," Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link Techniques for Estimating Flood -Frequency Discharges Eash 2001 USGS for Stream in Iowa: Eash, David 2001 Techniques for Estimating Flood -Frequency Discharges for Stream in Iowa Federal Flood Insurance Study, FEMA 2013 Emergency Dubuque County, Iowa and Washington, August 2013 https://msc.fema.gov/port Management Incorporated Areas D.C. al Agency Federal FEMA 2021 Emergency FIRM Panel Index ATKINS Washington, August 2021 https://msc.fema.gov/port Management D C al Agency Hermanson Iowa State Regional Flood Frequency Hermanson, Iowa State 1964 University Library Determinations in Iowa, M.S. R' E University 1964 Thesis Library Iowa Department Iowa ftp://ftp.igsb.uiowa.edu/gi s library/IA State/Admin IDNR 1990 of Natural County Boundaries Department of Iowa City, November 1990 Resources - Iowa Natural Iowa Political Boundary/coun ty.zip Geological Survey Resources Iowa Department Iowa ftp://ftp.igsb.uiowa.edu/gi IDNR 1998 of Natural PLSS Areas Department of Des Moines, March 1998 s library/IA state/Admin political boundary/PLS Resources Natural Iowa S/PLSS sections.html Resources Iowa Geological Iowa ftp://ftp.igsb.uiowa.edu/gi IDNR 2009 and Water Digital Orthophoto Department of Iowa City, December 2009 s library/counties/Scott/2 Survey, DNR Natural Iowa 009 color airphotos 01. Resources sid Table 33: Bibliography and References (continued) Citation Publisher/ Publication Title, "Article," Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link U.S. Department of Commerce, Iowa ftp://ftp.igsb.uiowa.edu/qi s library/ia state/admin IDNR 2010 U.S. Census City Boundaries Department of Des Moines, July 2010 Bureau, Natural Iowa political boundary/incorp orated cities 2010.zip Geography Resources Division Iowa Department Iowa of Natural Department of Des Moines, IDNR 2014 Resources - General Structures Natural Iowa January 2014 Geological and Resources Water Survey Iowa Department Iowa Statewide 1 M LiDAR Iowa Department of Des Moines, IDNR 2014a of Natural Collection Natural Iowa February 2014 Resources Resources Iowa Department Iowa http://www.iowadot.gov/q IDOT 2011 of Transportation Transportation Features Department of Ames, Iowa January 2010 is/downloads/defauIt.asp Transportation x Iowa Department IDOT, LRFD Iowa Department of IDOT 2014 of Natural Design Manual Natural Iowa City, 2014 http://www.iowadot.gov/b ridge/manuallrfd.html Resources Resources Iowa Iowa Flood Center and Iowa Flood University of Iowa, All Approximate Flooding IIHR- Iowa City, October 2013 Center 2014 Iowa Flood Center Sources Hydroscience Iowa and Engineering Table 33: Bibliography and References (continued) Citation Publisher/ Publication Title, "Article," Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link U.S. Department NRCS-Iowa, of Agriculture, Des Moines, NRCS 2008 Natural HUC-8 Subbasins Iowa and EPA Fort Worth, April 2008 http://datagatewaV.nres.0 Resources Region 5, Texas sda.gov Conservation Chicago, Service Illinois USGS & The Iowa Iowa Natural Resources Natural Council Bulletin No. 11, Oscar 1973 Resources Floods in Iowa: Technical Oscar, G. Lara March 1973 Council Manual for Estimating their Cooperating Magnitude and Frequency USACE U.S. Army Corps Detailed Project Report for U.S. Army Rock Island 1974 of Engineers Flood Control. Monticello, Corps of District, IL October 1974 Iowa Engineers HEC-1 Flood Hydrograph U.S. Army USACE U.S. Army Corps Package, Generalized Corps of September 1990 1990 of Engineers Computer Program, Version Engineers 4.0 U.S. Department U.S. Department of of the Army, Corps of UNET, One -Dimensional the Army, USACE Engineers, Unsteady Flow through a Full Corps of Davis, 1997 1997 Hydrologic Network of Open Channels, Engineers, California Engineering User's Manual Hydrologic Center Engineering Center USACE U.S. Army Corps UMRSFFS Hydrologic and US Army Corps of Washington, November 2003 2003 of Engineers Hydraulic Analysis Engineers DC Table 33: Bibliography and References (continued) Citation Publisher/ Publication Title, "Article," Place of Publication Date/ in this FIS Issuer Volume, Number, etc. Author/Editor Publication Date of Issuance Link https://www.mvr.usace.ar mv.mil/Portals/48/docs/F RM/UpperMissFlowFreq/ Upper Mississippi River U.S. Army USACE U.S. Army Corps System Flow Frequency Corps of Washington, January 2004 Upperoo20Mississippi%2 2004 of Engineers Study Main Report Engineers DC ORiver /o2OSystem /o20F1 ow%20Freguency%2OSt udv%20Main%2OReport. pdf USACE U.S. Army Corps HEC-RAS River Analysis U.S. Army Davis, 2010 of Engineers System, Version 4.1.0. Corps of California May 2010 [Software] Engineers U.S. Army Corps National Levee Database: U.S. ArmyUSACE Corps of August 2019 https://levees.sec.usace. 2019 of Engineers Levee Data Engineers army.mil/#/ Bulletin No. 17B, Guidelines U.S. Water USGS 1981 USGS for Determining Flood Flow Resources 1981 Frequency Council 2 00 r-) > < Z F-- LJ LLJ LL. or4 z 0 F- < > LJ I LLJ mm 980 970 960 950 940 930 920 910 : : : : : : : : : : : : : : : : : ...... ; m . m ; . . m ; . . ; m . m ..:.. l'..:..'l..:..;..:..: ... :..:.. i..:.. -;..,..:..;..:..:.. : : : : : : : : : : : : : : -.�d: : : : : : : ; . . m ; . -;.. �..: ... ...... : .......................... : : : : : : : : : : : : : . ; T oi 0� m :.. . ! � � ANNUAL-'. ::QHANCE:: : . : : : : : : : : : : ........................................................ 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ANNUAL CHANCE FLOO LLJ ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ MEMEMEMEME MEMEMEMEME MEMEMEMEME ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ MEMEMEMEME MEMEMEMEME MEMEMEMEME MEMEMEMEME MEMEMEMEME MEMEMEMEME MEMEMEMEME MEMEMEMEME MEMEMEMEME MENNEN CROSS SECTION / � ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ D. ... /11 11 111 II 111 11 111 1/ 111 II •III • 11 111 11 2 00 > Q z LI LLI z 0 F- Q > w J LJJ 690 680 7 6 0 660 650 640 630 620 610 . . .... � . :ANNUAL': CHANCE.....: ......:.......:...........:...........:.......:.......................:.......:......... : ....... BJACKWATER.:. 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W. fill ............... 7,000 7,500 8,000 8,500 91000 9,500 10,000 10,500 11,000 11,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH COULER VALLEY CREEK 12,000 12,500 olMls 770 Ul LLJ 760 0 750 C) 0 0 -i 740 Li- 730 1 720 710 z z U ILI I D 0 D m z 0 55P 'U L-A 0- LLJ 0 n ro)" 0 5/27/2021 19061CINDOC.png(4400x68OO) GRANTCOUNTY CLAYTONCOUNTY LAFAVETTE COUNTY HUC8 07060003 Grant -Little Maquoketa Watershed CTTY OF SAGEVILLE 190122 CITY OF 107 UBUQUE 195180 OOF 0425E 1012021 BI7012021 JODAV6RCOUNTY a HUC8 07060005 Apple -Plum Watershed JACHSON COUNTY JONESCOUNTY 0025E D � OOSOF 0075E 0100E 0125E 8/1012021 a10/2021 8/1012021 8/1012021 8110/2027 CITY OF BALLTOWN HUCB 07060004 CITY OF CITY OF l9Qgg9 CITY OF Turkey O.UXEMBURG HOLY CROSS Watershed ]90040 ]90055 / qy SHERRILL 190306 ,3s I 0276E ••O1JOE 0135E htF�:•°` 0188E �°eDV,a. CITY OF 0208E xtOP e110120x1 tarp ITY OF enalxort a/lorzozl naxox °, 6A ICKARDSVIL F. `D ANG t905 CIT OF 190119 CIT OF reap M ASB-RY 0270E mtaxort NEW ENNA CITY OF C Y OF 90 190121 NKSTON i oat, 19 370 145E 188E 170E r 0200E BIt012021 0x1aF enoao`z1.,.mil 0220E- .� :"' 0130E OI2021 8110I2021 BItOlIox1 '0255E % �'6•�r`<x CITY OF 0330E atoizpa 10 el n7, PARLEY DaN„a. co UNn[nr]wnl ay l Arm / Y1 DBLRWARE I9OS75 If0111 033a COUNTY ozeD atolzo2l � 0285F. y„ n.�', elarzozl � o CITY OF TTY a2wt �r ..:m � ,_, ",r,�,• OF „ CITY F onoF 0290E 0295E YERSVI anorzOr utorsort enono2t ��.,,EPWORTH E09 A CENT ALIA— LE '^o`I90�576 190.00 19012 m-• 19007 �� J� I.ITY OF Z""4 7 0025 OJ10F eN ax027 349E � OM N 0306F' a1 If 01x0 0285E nr . _Q I T-HHA'6 5Na2021 N 04e0F ��enol:oxt CITY O N - o `` : 0525E C 1a2021-' 0458E 190123�, orzoz' ERNAR 19002 30E 3az021 ITV OF F �� e11012021 ZWIN(�1. 1I190371 _ 90117 � HUCB 0706000 Maquoketa 0550E 0465E 0/70F /90F 0498E Watershed BI7012021 0410E '0445E 8H 0/2021 BM0i2021 f01't0z1 atax0xl 1YM=28.000 fnl 1300.000 ND 12,600 26,000 80,000 MRp PmlectlDn: Univelael Trenavelae Malealar ZDna 15 NDIM NONh AmfiNeen Datum 1983 THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING OOW MENTAnON ARE A150 AVAILABLE IN DIGITAL FORMAT AT HTTPS:// MSC. FEMA.GOV SEE aooD lxsuRAHDE sruovinR ADarwraLaFORrAnox 'PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS -PANEL NDTPRINTED -AREA OlR9R)E COUNTY BWNDARY NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP INDEX DUBUQUE COUNTY, IOWA fine mDDlpafile0 Arefie of PANELS PRINTED: fY'tND sfE M340080 Wifi 0f00,m38,M9fi,°199.Mfi8, O1W, 0161, 0188, 001]0.0Y00. 03°5, 091D.09]0.03]6OM. 039°. 0390. 0395.0936. 0901, 0990.029E 0211. 09<2.°w3. �I _ O}4, 0907.0900 ONE. 0310.0910. SAFE. ONO , ONE. ONE. 09Po. 0396, Qi98,0330 I 0333.°AN. 099°.CO. 8, 0981, 038R, 0983, 09M, °3fi0, P956, 0300,Ob3, 09}O.wW, wmDHm w35. Daeo.D°as. wee D°]D.afiD, D°e3, wafi, DseD. D°95, Ds93. DSSD MAP NUMBER 19063CINDOC MAP REVISED AUGUST ID, 2021 https://mapl .msc.fema.gov/data/19/P/Firm/19061 CINDOC.png?LOC=a485c7ddb024454e923bfac3f347b729 1 /1 � erNON B ALIN �IXmJak, .�lalx�aln.�R: � "'r' A;W '� Bic•'► yh-=-- ff -,'WI�' , ✓s, mo' ^ I �pp r A, I L `. It r l ' ' � 4 R I N / ti Ifffiy i.,, y: t i 1 � .r , o F. , FLOOD HAZARD INFORMATION NOTES TO USERS Val RMRTWR amtm=some lR AWmm Man POM arcane THE INFORMATION DEPICTED ON THIS MAP AND SUPPOONG DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTFPS://MSC.FEMA.GOV Wifthrout ibad Elewtlq on lBF 2-eA IDue Fl,V.AVS WBFE or Depth Z0-AeAo AnVL AH SPECLF00D Regulatory Headway 1412AROARFAS _0.2%Annual Chance Flood Record, Areas oft%a... al choncetlood with average depNT an than one foot or with drainage areas of ran Man one Square mile. c, ie Future Conditions f%Annual Chance flood Hazard ro,,. i Dr-r�a AcenNoit.. - Und Flaad RlsN tlueto Lavce OFLOOD HAZARD FLOOD NAIARD'gaP0,Oj. II►►•/�a�R;�JI�pJJr Areewl[h Flood Risk due to Leree m„cD I NOSCREEN Are a Of Minimal Flood HEcwda„,•r OTHER AREAS. Area Of UOd¢larminatl Flootl Nazaed lm,=n GENE ---------- Chanlrel, Culverh or Storm Sewer STRUCTURES Levee, Dike, or Floodwall Cron Sections MRh l%Annual Chance DT's Water Surface Elevtiaon ea----- Coastal Transact -----CoastalTrensact Baseline ---- Profile Baseline Hydrographic Feature —al— Buse Race Elevation Line IBFE) OTHER Limdof Study FEATURES JudWWon Baundaq e.„ mp.m sm•,N+• awx vw rx.JwN.,m m nx• Nq W.,. wMw J,m,N�.wN•xJ pN. ImLan�•xxba� m� ampfq•^I INi,% NmJ'�'WW pnu mi u _ x„mm„ w "� a : agwv u.n rzw rxa w»oaq c„up. • m every p•prt mrvv aiyd�m b �e, nvi �mp� . Nu,.mmm.M.�MN�,e, aJ,miam,gmxx,.. FIR. a�",.,.'�,r',pMi a: "r"n•m..'4mv`»�e;amaaww�n ,M raw,..p s.'.�.,•a°�°,:�a°•""m�e' u e m m.,mxx ..= �mmw• m.p m,...x. m n. Nm. w..M. s.a. p.,a a m. wrxaNx.. . ,q.m.m v,oanm :i"+ewmsaezR. m""'"m ,onxN m•Nmm„m gm,.•mnwxm.m, — wxe1iJd.. m*.,an w.. wiwmm dx•N,J 4WIND vmx rex.xmm+nm,J.xoxu.xveu: wmmx xx,xgno,a; vxnw oro„x: eavo a N1 Inch m 1,000foret 2:12,000 0 1,DOD 2,000 4,0000 me er 0 250 500 1,000 PANEL LOCATOR 0210 0217 2TS 0220 095 0330 0335 • PANEL NOT PRINTED E 1 O 0 v�A w U NATIONAL FLOOD INSURANCE PROGRAM DUBURUECOUNTY, IOWA ��- Bar .,,,215aF550 � �' - COMMUNITY NUMBER PANEL SUFFIX veoass oas WEWe.twx0r veveo 0 weuauacauxn vamv one., i VERSION NUMBER 2.4.3.0 MAPNUMRER 151,061CO215F MAPREMSEO AUGUST 10, 2021 • I / i 1 A liI3 illld'p\ f/ , Is0. I / '+ iY -. .. � 1 w 13 ne (/ FLOOD HAZARD INFORMATION THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTPS://MSC.FEMA.GOV WlMout Besa Flood Elevation lBFLI WBk BFEWDBMUI:- ve. AN HAZUD Fl00D Regulatory Floodway NATMDMFAS _0.2% Annual Chance Flootl Hazard, Areas of 1% annual chances fiend with average EeMM less Man one foot or with drainage areas of less than one square mile mom l Future Condl0ons l%Annual �I Chance Flootl Heiard .o,— I SArea eeN with educed Rood Risk due to Levee OTHER ARM OF �p ROOD HAZARD AreB with Flootl Risk due to Levee zancn WUSCREEN fiamef Minimal Flootl Hazard.nmmc OTHER AREAS Area of Undetermined Flood Hazard mono GENERA --- --- ----- Channel, Culvert at Stan Sewer STRUCTURES levee, Dike, orflootlwall E fa'a Class Backus .10 1% Annual Chance tx'6 Water Surface Elevation e� ----- CoastalTrensect ---- Coastal Transept Baseline --- Profile Baseline Hydrographic Feature --^' I'l — San Road Elevation Line(SEE) MER Llmitelstudy FEATUREB Amedktlon Boundary 0111)1 1 (11111.WtP WI. Pb FagNInv vp ...I va Pv.n• a••m•Xe 1vo=.vvvFX wlw WW na ar aM IIFN , w-- I ilmt m o, nvanao It I, rn,1 In� p w d •rvkaXC MrM-II. I. Anvclm 6wh P,PM1 �N}YI wnb uE nI an eq"a.e„XXun»,N.I..,,.gXnbe�r.� on. I. .m� I.Ira.w••n,rlq,...rnb,n.—.I... va,.1. w,nn.—.I.v`a elqu 1..-1...rtnati.1a evfpw uu on— enYI.n numm I.M ., m..I..r:v w. m.n .. 1 e... aX, w n. 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MIND 0 29 w I A.. _ _---._ — —_ — .. AZ ' e axx_.. - _ — - re'd6'0Y 4a•sece ec° 4e 45 City of Dubuque 195180 FLOOD HAZARD INFORMATION NOTES TO USERS SCALE SEE HISRWRa UD MMDMD IeDEII Maa POR FIRM PANEL LANUT .a nnn:u e,a rywwn eww xe vpee inu,�,nw aex wp awel wexw qm,m ewwxf urolnlexn: THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING nuviq rm xw ah Ru.. "'1 �w qpo ' w In exnp1xe�n:oi "vN�vee�i oeeurcsraN'voee `x'�ro"cee nrea0, DOCUMENTATION ARE ALSO AVAI TABLE IN DIGITAL FORMATAT snunim-n.:w-".11.1--II 1n e�w .,.a etrExn uwe ewe ` c ro ae nu n.°"„ Aqud .,a.e d nw `aa�a 1 inch m 1,000 feet 1:22,000 Hl-FPS://MSC.FEMA.GOV ur,..:.°,'ea... ee,.-A°a°"�e��..a awrer wa,,, ue x.euu. .,w� un .M.wm,r u"m,�,aa mn. °.n.x,mP•un. ww."�wew...ee.. 0 1.000 240W 4,000 - Without hue Flood Elevation HIFE) v a,nu, e. r r mw rwwa.Asemeecwxr., n. w,ww,A.a fee ZNIe AN A99 ANN OR ar Depth rim, AN, AL) AN. Ve. me me ee.e .wew FvA,'e ,w, x. metero —+n we m,„,vmee c .. euq n..m, a n. Nnwa 0 250 500 1,000 ePECULAzN,REM �a �WletoyFloods" r.eem ..mex.,x.a.::.«un. �unvw ,:w.nwwemamne wen"., XAZMOMFAS RiR� 0.2% Annual CbancFlood Hazard, Areas •wAva I, aaa, „au.,wn,awr,mm, n, to No PANEL LOCATOR —aft% annual ehana:ftecwithaverage w.. ma�n.�.w,ow",e depth 1. then ... foot oI dralmge ' areas of less than one square mile m„os - Peters Candidates l%Arcane l 1210 ,i 023E [O4ELQ"d Nance Flood Hazardo,m r ■ 1 i Jf See NotesReduced Flood Risk due to Lester IIr�0���qq FLOOD HAZARD Ye,,V, Area wNIM1 FlOOd RMN duo to LeveO <mre 0 ONSh Areaof Mlnlanc Flood Hazad1 021E 0217 0236 OTHER AREAS Area Of Dndeteannined Flood Hazard Y.mmn GENERAL — Channel, coot, or Storm Sewer 11215 STRUTTUREp xvxnx"n:"x„": Lease, Dike, Or Floodevall e 1e's Gross Sections with l%Annual Chance Water SurfaceElembo" 023A lJ - Coastal Forecast ----- Coastal Vansect Baseline ---- Profile Baseline _ Hydrographlc Feature , - V3— Base Rood Basilan Line (BEE) 0300 0335 0332 0151 me umltof Study � 0237 0230 MURES ludstllclbn Bountlary i •PANEL NOT PRINTED �E £ NATIONAL FLOOD INSURANCE PROGRAM �LI FLUOD INSURANCE RATE MAP 3. Q DUBU0E�COUNTY ,IOWA W 11 a PAxEL220a550 � w t` H C eOMMUNO NUMBER PANEL SUFFIC tl1VM Moen a] 0 E.K., O DusterE' wmn accoo a. O LL L13 O f0 Z VERSIONNUMBER 2.4.3.0 MAPNUMBER 1906IM22OF MAPREVISED AUGUST 10, 2021 FLOOD HAZARD INFORMATION NOTES TO USERS MERS REPORT Nor DAMLLD IEDERDAND lX IMPWR FIRM MR rummlT 1. move nm a. RURI, `Ipw peeuu e,.w,m "':In�tluw,na ON AND SUPPORTING THEINFORMATIONDOCUMENTATION e"im., Ie,w ariiMMTi�n°wrNnt n. ilwa ALSO AVAILABLE IN DOCUMENTATION AREALSO AVAILABLE IN DIGITAL FORMAT AT ,pe'Im maw. uw:p. n Il FcuA w ww eww, wem e..n °°'In"..Mw.,�o, HTrPS://MSC.FEMA.GOV - me'Y°a w:rM:. u:aa:a ole:""mminm nomw `"pi nn"°mso Ban need Elevation UHFE) c�M,MxawI.R..:ws.�TM.—ml e,Me"ea:anbe°u°:n;.e M:e:',i:..am®:":.°,�nr�.e:�a r ®Without Zm,eI VA95 With OR a, DaNh:,:,:,, .11, A� AN. 11, AR ,,.,.,aN.w munm+a. •.R.w. ,.m m M. Paw maw,.... a:wr R—,1 a, nx w,uienR. SPECML ROOD RBWIa10, Y FlMMtlw eY HAZARD AREAS Mow m.n.w mu.. nuo>RMama Annual Chance Flood HararQArees mm,,mnwc., �0.2% of 1%annual chance Road Wth manage wq wl ww�Mwma X�e co" depth less than one foal or Wth drainage areas of less than one square mile e.,,x �WIB�aIM Future 1% LOW@'"A ce Moitions d Marked,, nual Area wOh Reduced Flood Risk due to Levee ONERAREASOF'�/ Yilf.1'j See Notes.:+.". ��I ROODHAYARD Y/Oj Area Wth Flood Risk death Lose zo,•,.D bC� Ili Am..f Mlnlmal Flood Ha.wd , . t OVER AREAS ;,' Area of Undetermined Flood Hazard: „,,=o ----- t, A,---- Cheate, Cohort Stwm Sewer GENERAL STRUCTURE, LBveB, DING, OrFlmdwdll i Cross Sections wNh l%Annual Chance Water Surface Elevation a---'- Costal Tfaesent — COBstalTmoseel Baseline ---- Profile Baseline Hydrographic Feature ---Ma--- Base Ford Elevator Une (BFE) OVER UnitofSmdy RIMB RCS Judsdlotian Boundary SCALE / .,°Maws.: M: NMO TINxM.Spl, aaa.0 An NA,It011BLUM SBeI: wnlmm x.,Rleenan: vx. rou wwR: Novo m NIInch .500flat 1:6,000 0 500 1,000 2,0 meter. 0 125 250 ADD PANEL LOCATOR 0220 Me 0237 0230 PANEL NOT PIMNTED NATIONAL ROOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP DUeU�UE COUNIY,IOWA l we a. IAN11236OF550 1y&6 II COMMUNRR NUMBER PANE. SUFFDI oneurr, cn o, 1Bdlan B23a F oumvus. Mleo1. sw D-.M SIANIILF,CnYGf 02ae f VERSIONNYMBER 2.4.3.0 MAPNUMBER 19061CO236F MAP REVISED AUGUST 10, 2021 9P 41- IF so -a ws' !,iRrC6�ri0NE AE ZONE AE 15 d YO u o� Dubuque County Unincorporated Areas DUhuryrr(-I ..... I, 190534 n �1 1'hu'urpnrnlrtl \ :roue {+ � 19115JJ [ le nre a r1111l1m oNllal PANEL lei ncarrn NeNsi AsrAK0 G nn,mane to Nopnr NANoe fib "14 N C O A., ;Y M1M1 .,L�.,v/J�/ 3 ZONE Al \ h l v Dulnuym Cr nh a art c I'nr Irprlm .hell 1. rap 3 s W t 19115JJ �e 11 n c SRO IMB OF .,run. A [eeNpwecm an ) M1 Ip n � cruconrvl y // ZONE AS / I nn City of bohnque ,.tl1 1951A0 prep 11 g C.4 ZONE AE Lp �:o,AR+pNwp r.� �d City of Du huque 195180 ZONEAEE m� 1 G m 31 Or _ --.- 90'IP 1Y 42°31's$5" 90° 4307 5" FLOOD HAZARD INFORMATION NOTES TO USERS SEEPS REPo M OMILEO UGODAND INM RSVPOR HRM Meet WyMT THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCOId[NTATION ARE ALSO AVAILABLE IN DIGRAL FORMATAT HTTPS://MSC. FEMA.GOV Willmut Base Chad PcIation(DFE) With BFEMDepth v. m. ve. AN SPECIAL PLOD Regulatory Ro parey HAZARDAFMS 0.2%Annual Chance Flood Hazard, Area oft% annual chance flood MiM Manage depth less than one toot or vAh drainage areas often than one square mile mneA Future CondNlons 1%Annual �HYA Chmwe Flood Ha2ardzmm+. Ara afth Reduced Road Risk due to Levy OIHERARFABOF BAe Notes. ROD HAZARD rrMMlen•JIIr��,II Area wfth Hood Risk due to Levee z000 0 LMWEI I AMD of Minimal Head Nauru m•„ OMER AREAS Area of Undetamllnad Rood Haven z„I�: GENERAL Channel, Culvert, Or Storm Beaver STNUCIURES Il,n,n, 'Il'^ Levee, Dike, or Floodxall ' E 10'e Cross SISIath 1%Annual Chance (� the Wat"Spetace ElevaOoR LI ----- Coastal Tra sect ---- Coastal Tfansect Baseline --- Profile Baseline Hydrographie Feature — ,o — Base Flood Elevatlon Lim (BEE) O1XER UmN of Study MMRES JurKdktfon Boundary e mmmmw m N�IRYIw.fYWw �.,wnw FIpM�IwWNR nwwNawMSR MNwnnp pp IRY nwn P IWIq In01 pnxY �wmA � MN 9 p IMe �° nRR'Igmuwu%+ j1 4G . WA -a' Melnv dlWwOrafrc�^enb •m,nre e�ieWmq lw[ry III AI ana da °rob mv0. cwm.wlm.wp.wl nau Nwwrwnwmn..mrW macaw. le...'.. Taw Wre. acme a,.nn rvmRw.mwuwe.mwa,.N,nx. wma,aNN „wwwdY.ww..IR- mm,mm. w nwmwanwnes.mwnm .:1- N.D. w.wrv:h w11 pA....wwN°°.4I 4. row.t w n.lw. o.PI a'I w . ..wwuw ....u... SCALE o[nswrrn.1-1 111: Nmin ear 11—a,., 19e9', Wo [. . 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Are. with Reduced Flood Risk due to Levee See NWAS. _,,, x 01HER AREAS OF'p�'ja ROOD MUEARD >♦/Efy Aroe wIIM1 FlRed Risk due to Levee CIOCfiF,EfR Ana of Minimal Flood Hazard OTHER AREAS 1 Area of Undetermined Flood Hazardc GENERAL Channel, Culvert, or Storm Sewer SRIUCTURES Levee. D11, MFInceall Cross SectionswlW L%Annual Chance 11'a Water Surface Eleratlan ea----- Coastal Transect —..-- Counsel Transect Baseline ---- Pm01e Baseline Hydn,graphic Feature -w—n>•�-- Base Aced Revatlon Line(BFE) MR UmNof SWdy FEATURES )odsd100n Boundary IXa..... w. rme m. — wl. ImrwNu..Niw opN®w.• m aw mA mm.l m i ,° inns6 • n W m am sN. ,w�, .xu.re. ,m :nl', rut x H— 0 � iair�s�u SWw ll-errve a eml�um en n uemau."e. IPaw.ca.'"n on `w"'or o�w'�.,e an`.a wm`... 111. °w� ^•m FIBMN .Ti.,.�n1eMxa tl'r MmJ.. 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''��.� 1 J h r —ty x•�.C-s r... o'k ...A.y� � r � r. 1 vrr:; �'. ..r. �''�i 'i� '.� ii•�'t�" i�� "�.T-� Iawam�cwaaFn�';;In ,uu uslc rcv�� µ 40 f r , r • r l 41 •r- pN nt > l cl •l� \ I �\ • �p 4 �"'.1'J" yy1�~ •.)9C. ~ �.� ` ) R ♦ III l¢ i..' i i. 1 y ! + �, 9 � _ y �, �♦1 V d' �' ,i .• ay(1 y. �,'�,. y r ` H �y$1{yam` 1 yg `rj w ��r��• !* �.5�". 6 a � 1 > }, �`a _�':i. � :_.:i �; � � J� ` � 1 r� Il �t• '-W � �• . ..Iit 2• ,.L �A. riY., V_c�wS j"��. h. , 0739 N\ V 1. ;1 (1 !i sur- d °c JJ Dix �$ •Y • r F.i: 4 S +- ,Ile r O e� x y y FLOOD HAZARD INFORMATION NOTES TO USERS SCALE THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMATAT HTTPS.//MSC. FEMA.G OV Flood Dewtlen lBFE) ®Without I A' lan k, AA ne9 WRh BFE or Depth zone A6. Au, al... s, SPECIAL R.WD Ra latory HoodwAy LW HAMROAREAS e®® —0.2%Annual Chance Rood Hazard, Ann oft% annual chance flood who average depth lass than one foM or with drainage areas ofless than one square mile cune.r �A�LaRE Forum Conditions 1%Annual iOIAf" it Chance Read Hazead r • • I Area with Reduced Flood Risk due to Laurie �-j fide Notes. a.:: c OTHERAHAZARDEASOF fL000 HAZARD �/ ,A� ID/�s 1 Area with flood Risk due tO Lavea:'":,•:I. 'NOSCREEN Area of Minimal Flood Hazard:,,::. •. OTHER AREAS Area of Undetermined Hood Hazeal...... GENERAL Channel, Conran, or Stolen Sewer STRUCTURES . Inn, m:, Levee, Dike, or Moodwall Cross Sessions with l%Annual Chance Water Surface Elevatlon IPI-----COBstelTMnsdct —•�—�Coastal TransessBaselina --- Name Baseline Hydrographic Feature ---en--- Base flood Duration Line (BFE) OTHER Umltof Study FEATURES ludsdimon Boundary iw mbmua. m! xM �uwu emw ins Ebb Imuma n.b YW 1fMHl..ree,q nwml %b , • v map b ,w vG FlRy .IAiw'epe'InbmsunWn.,pF el •AV (I.BPEId%])6Ell fie, muuE,YpPW. M•pE6::wAm�e�llAn¢Mnp.r. mu. Na.auY ••bx nws pnl,m. YNe un,n m wp Cnnlae 6Yq xEgn, al:ln wnbm w r a wee w.em u....mena weae:�w aew.¢, xw. w..Mn.. mMF'I:Ib:lmo...Mi. e:';b": al«+n IAmw Mr. Fw emvury.m mmmw .. a.n. max, m ue Fb.e b.:.... mwr n.p.n d nN Wa,ea:.•. MVWYn,wr°am Pmpnm n law<a m14" wmnu"b u.eaww �nwnnv ep.mwunn. wa..0 I"n.Finrn� . a.r wlro':m mm,el w be I— om.mm.l.l wmm emB W XnB leN� NiYM1 uMNln OMum ]n69'. 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Bow, n.Px nab aaxr �Im. ar mx cxP. .,.r°a,Le..;w°w 4.w.w,.e4,e�4.emrnm"amww Without Been Flood Elevation lBFq Zone AYB99 en. RR'E TER.i,4broWnlaBlNq,�Imn MalWYu:o°°°reawnaW.x,.'iw^r use Main BH of Depth UP- Az.n rrl, vI,AN n�' m,ar nN..e nmT.u.,nn inn innwe. rxm n.w.rc1 aN4 P1wxw4. µYam^. Regulatory Fleedway, 01 Y +=4xm4.amawnrvwlwww4r XAlMMDARG6 Pmo.m.in.unm.x...awxnxnmm.,y..nNarn,In..nnn rwe n4r.r4 Nrooeumre. Annual Chance Flood Hazard, Areas is �uu. wan er w. L.. wwr4m ar rwmII _0.2% of 1% annual chance flood with average en..m.....1O"w44..1.InII oNnbrerr.. n depth less than One feat or with drainage ereasofless than onesAuare mile.'. Ipi#®ilrli Mure Conditions l%Annual Chance Flood Hazard. -I y�y��"gg�r with Reduced Flood Risk duets, Lease VPty SArea eeN OTHERARFAS OF I ;ya I ROODHAZARD Area wlN Flood Risk do. to Leine mucO m�4y� y.Irv^ Area of Minimal Flood Hemr z.,R+ fEM, OTTER pRFAB, Area of Undetermined Rood Hazard! nx.,m GENERAL - Channel. Cahrerl. or Storm Sewer SMUCr �-'I min"P'mm 111, 111, 11 11Ill E 1°� Cross Senlons whh 1%Annual Chance 11'a Water Surface Elevation O'---- Coastal Tensed — Coastal Trensect Baseline -- P.M. Sesellen Hydrographle Feature —on— Be. need Elevators Lille (BFE) OMER UmRol Study FEATURES ludsdlction Boundary KALE 'LIPPRA IPPIPY4,rm4m c n. zsvrwm,m.,N4amxm zessl wee xm xcm.Pnmr,.vwlN. o=me N4v0ae N1 inch • 1000 feet 1:12,000 0 1,ODD 2000 4,000 Screw meters 0 250 500 1,000 PANEL LOCATOR Woo 02H ME �I E NATIONAL FLOOD INSURANCE PROGRAM �4 CO FLOOD INSURA - DUBLUUUE COUaNTY, IOWA O W d MNM330ca550 w V IIA C N C COMMUNO NUMBER PANEL SUFFIX .,nrIscaw ."Ql.aon. caa0 r O ept. ssosed . r nwema .e O IBDDr.srB .P. terroroaw I LL tQ c X'12 j-z R Z " VERSION NUMBER — 2.4.3.0 MAPNUMBER 03/N 190610033OF MAP REVISED PANEL NOT PRINTED AUGUST 10, 2021 FLOOD HAZARD INFORMATION NOTES TO USERS SCALE THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTPS://MSGFEMA.GOV Milani Without Base Flood Demotion fBFE) AlR WAh OR or Depth mne An. A0. AN. Vt. AN SPECIAL ROOD IIey,IBtOry FlOodwBy HJUARDAREAS -- ,.Y_p 0.2%Annual Chance Flood Hazard, Areas � of I%annual shared flood with average depth less than one foot at with drainage areasof lessthenore square mile •gw Future Conditions l%Annual Q 1 Choose Rood Heard - i, z . J•-+e Area with Reduced Flood Risk due to Levee dSeeNotes,,— OTHER AREAS OF FLOOD HADVID P." _Y M'A Area with Rood Risk due tO Levee ',... NO SCREEN Area of Minimal Flood Hazard OTHER AREAS Area of Undetermined Flood Hazard:. GENERAL - Channel, Culvart. of St.. Sewer STRUCTURES 111 ff. Levee, Dike, or Floodwell e 1a'a Cross Sections with 1%Annual Change Water Surface Elevation l'J----- Cozi:hH mnsedt —�--- Coastal Trounced Baseline --- Pmfile Baseline Hydrographic Feature —01-^ Have Flood Elevation Line (BEE) OTNER then of Study FEATURES ludsdlction Boundary .....1i. Tivem". to ewowr lan.� "town e.i maw �xa �P uMt vun ilaiia.'M u" n WE. n t W to by R. ntW"ine — 5" xWpM a�w el IT'trmb n el Wt nwp �INweei-n�t�rr'n�uut rsm e, eeienee 6ngn mow Mntplx. nt .1w FIPM INxw I=merry baMnroedlm.Y/,nm NxFWe u.1 z—Gnw�IW wY, YAM .w .a 11..e .W.nwm I a,." Nx. n x. Fl.m w-- sww awn a, mot Iwo... %now.'t row1mrn...l. mo.t.1• mmm 1 ewxw ra, V.—AsAN w we en nnaw,nulma.wnm.Nwar11RMNsen mxaaoni.n'ew.. mat. w ax wuw a�n 1 E.1-1 m.mora,va'i=.ai mwN'.'u'vo'ee .�xxwn so.o zees: N1 Inch • 600 feat 1:6,000 D 500 1.000 2,OD0 Mat ma he 0 125 250 50D PANEL LOCATOR 0238 0351 om 'PANEL NOT PAINTED I NATIONAL ROOD INSURANCE PROGRAM FLOODINSUF DUSUQ ECOUNTY, IOWA .N„332d,550 l-vu CDMMUNRy NUMBER PANEL SUFFIX asevnv. CmdF warns ova F MWenaUEMYOI l%190 o".z f uaupueegmn asoesa osz r VERSIONNUMBER 2,43.0 NINNUMBflt 19061M332F MAPREVISED AUGUST 10, 2021 'ezm"'E •pa°"^E "RED.napmr.E so•Asar City or Ashhury osTm"`E City or Ashhury 's au Dm 1')OUsa �190US3 .-- ep.e'Ps 1�IS on c3' Sir , R. WHIRTLEWRI To 23 A J 9 E ('lly or DN J I95I SO f�W f 1I Yl�'i�4 ICI' 26 B EPox.IEP [i LIMIT OF ` STUDY \ - ZONE THIS AREA SHOWN ATA SCALE OF 1" = 500' fir ON MAP NUMBER 19061 CO332 Unhueue � '- 194180 -S 5 N ZONEA } 4��JLyYJ ZONE A� T a_h_N. an N e.. + ZONE A -:. ,nd �.: I: .- •_w - REDER ZONE uxr.x 0 ..._. -SONEA wuEYDA WPM 3 S� 3 d I C it, of DIEh ague ZONE A-% + IM, y +1 LIMIT OF/ STUDY 5 2 — _—.�_J RID 5DEDIRMI DR r d n o ZONE ZONE..xw.. A ED, e E. /, J P o A OP i ewfe wAErtmP _e I r T OMIT O: i " PPu r "APO �8 % - .PP ; ♦ A eeP.mrE OP I j "�.✓ T Do'.F r, $ 1 ZONEA �_ ( V^ T tau op ` �� )• � INIT . 1/ alp nproumN i2°26'15' 90Va'UY bE apI ae's' ,.lo FLOOD HAZARD INFORMATION THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTFPS://MSC.FEMA.GOV Whho Bane Flood Dvetl eon (BFE) 1-DA.V, A99 With BM Or Depth Gwe Ar. AO, AN. VE AN SPECIAL FID00 R�4Bg�B M IatO Fl HAZARD ARFAS @B® W FY oodxry ®0.2% Annual Chance Read Haaerq Areas oft% annual chance Noodwtth averege depth less than one tot orwith drainage ..as at less than Bale square mile m„ea apCa; Future Conditions l%Annual -` Chance Rood HazardmIe> >w Area with Reduced Flood Rlsk due to Leree See Notes..:.=z OTHERAREASOF ROOD HAZARD ' Area with Flood Risk due to Levee Yoncc �NOSCREEN Areaol Minimal Flood Narartl:•:. 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DOCUMENTATION AREALSO AVAIIABLEINOIGRAI FORMAT Ai "N"Hrb.c.nb, nmew ni eamudM.�Fti hmw..Lamm o�'le.uw�.. ,nNe°.ariamw`wN HTTPS://MSC.FEMA.GOV iarvmu:.. oAe"u °ANe"e e',u. nb°°e°r e"MMM SMmt, tiee M'.w.�. Without Bm Mood Elearlon (BFE) INramn°11,1.a°,•in::.'9.°�aa;e".:ew;hbm,n; r„ AI All - With BFL or Depth mmal..A n, vE. eN mwNN.Mm..mw.m.PeleeIN, x m. Fx.e mmmm e,.p R,Pd, a, nN ONamxn. SPECIAL1001) y�jI�� Ra IRtor FlootlwR N Y Y . em.'..e e,..,.M. ,..maxln ni ,,.mnN. mnuavar a...m..mMwmux. wan., MeN NALIRDMFAS SIB® M.— P., a ,ew<.eeero•m Annual Chance Read Recent, Areas Ne FN,FIRM Fee NNIN nawml�mmm w D. am O.Fxnxm m mum _0.2% M1% annual chance flood with average R.wr-1'^,MeI- ..m P. n. n, depth less than one foot Or with drainage sreasofleasthae one square mile:va,,.. 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A 1 )art"pip,l \•' mot,•. q, �r3 � � 4r5•Fdlf _ N' Yt �.F�I l.�rJ �� � an" USA a MIa '��k• 1 � � .� it L _ _ A h ' X r r a • to la Tx �I Ii � I FLOOD HAZARD INFORMATION NOTES TO USERS SCALE THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTPS://MSC.FEMA.GOV - Without Base Flood ETeveUon,BFO -_ With BEE of DepthAe, Au, AN, oe. m, SPECIAL ROOD Regulatory Floodway HAZARD AREAS 0.2%Annual Chance Flood Hazard, Ames art% annual chance flood Am average depth lass than one foot or with drainage areas of less then one square mile mue Future Condleons l%Annual IE TS Chance Rood Hazentro �,FF-,tw.ya Area with Reduced Rood Risk due to Laws ! Sao Notes. .x OMER AREAS OF ROOD HA2ARD yO�� Area with need Risk due to Laws zamn I NbSOREEN Area of Minimal Flood Hazard OTHER ARM' Area of Underamlined Flood Hazard m- f GENERAL ............ 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Ie h� 14 t., s / I k - -- 1 rt"it yN /( .vt'�I ' 1 I W 1 11, �r�et• ��_�' ^� a }"mod � � .�� '�; w � rA 11iI N1 of FLOOD HAZARD INFORMATION NOTES TO USERS SCALE 9[Ffl¢RFWnf PoRDETA1LfD1FDENDMIDINDIXNUFWPIIRN F.1N6l.1yDllF I--.- uq niuMe ier—ulu-swa THE INFORMATION DEPICTED ON THIS MAPAND SUPPORTING Ru �'uw »mi,wIt m,o Eni uel.mlaliiix �M:ei, III °u. rrxa DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT an, .I eiiiwaull°e haw .I ...em. «. «nw mm m. HTTPS://MSC.FEMA.GOV w ar".1 .1u w°°„°,�im°'m e`ea�`m�n«",eu ',�e"�. ema Who Baas Flood Elevation HIRE) AVA99 ion BFE 01 Doo Lane AL. AU. AN. Vk. AN Won, mmmu,ey am muumuu m,p ens, nb m nn Pme Inwmu &wr R.vl M xt lunkivan. SPECIAL FLOOD �Lq�y Regulatory FlDDdwey e*^^+^nn«�n.,.em....e. t� .m.m.,rvx, m..mnn»I.w,nme.wna.»e I. x.w.0 HAZARD AREAS ®® ^» m Ra Annual Chance Rood Hazard,Areas a". 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NIInch . 600 feet 1:6,000 0 500 1,DID 2,000 feel meters 0 125 250 500 PANEL LOCATOR m 0370 m \ MNEL w WmNrMD' h Z :4 NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE FATE MAP U DUBU$OECOr IOWA O m me 11NM358or550 �F WM"" NUMBER PANEL NIFFLA mmumcuecnrw ss aXmuN1 .1. oars r VERSION NUMBS 2.4 3.0 MAPNOMBER 190HiCO3WF MAPREVISEO AUGUST 10, 2021 FLOOD HAZARD INFORMATION NOTES TO USERS SURS REPoMWReFSaIMMOOMDINOQMOPIOR FlAMMXD.IAYdR rn wmr+mnn µnude uan na rbea nwn,e era un lvwul .wuw pm wmnn THE INFORMATION DEPICTED ON MIS MAP AND SUPPORTING m. �eiewv: DOCUMENTATION AREAISO AVAILABLE IN DIGITAL PORMATAT wn m m .°Nxemn.m ,an+xmr.wr ^w+raxxnl n wYe. 11. VArv..MWr. ,m u. HTTPS//MSC.FEMA GOV nNw°b mW wwxa n.°e"w viwwe r:`ro',ni.a a.w.,na ever r.m°w w b0f m°0' Without Dose FlDDd Revetlpa (Bl'E) ean".w.w'Fw•"'•ma xwa,anw.x,,.,xmm.,.. .+Rvx a.w+Iw maxwxe = dv.rNrwmw raw e. o. . '�1M With BFE or Depth -,? AL. ALL AN. Ve An HAVIRDMFASD. Regulatory RoodwaY we m„x.w r,ow.m. aoo veaw:'x""x"a. """rw, a•w"'°w'°'w www.x 0.2% Annual Chance Rood Nazerd, Areas Iax+.rNurwae^www ii yM wm a.. uxxem..awW,. oft% annual chance flood with average aw:,w.e e.e ixx.m depth less Man one fool or with drainage areas Of 1. them.. SQ.ale mile:'n.:,=A ��q,+�T FldureCondll asl%Annual ICiOFMrTI+i Chance Flootl Hazard .+ l �,'3� Area with Reduced Flood Risk due to Levee See Notes.. ,.... OMERAREASOF ROOD HAZARD �r�1/ YNp! Area with Flootl Risk due to Lewis zoneA !_ Area Of Minimal Flood Hazard arum ARM i Area Of Undetemdued Flootl Hazard ZoneD GENERAL —Channel, Culvert, or Stamm Sewer MUMRES ,,," ,,,n,.,,,,,,., Levee, Dike, or ROodwall a 10'o Cross Sectionswith l%Annual Chance f1.5 Water SarhOe EIBWUOn as ----- Coastal Transect -- Coastal Transect Baseline ---PraOle Baseline Hydfographic Feature —m-- Base Rood Omfion Line(BFE) OIXEq Umitef Study fUTUREe NtlSMCROn BOUntlBry SCALE 'm`iw..�i nn,m ...r..1. ssr.. ram a Izz..Wm rase', WX18m Memnpwie VaYCN neWm'. XPVD 99 NL Inch a 1,000 feet 1:12,000 0 1,000 2,000 6,000 feet weemmeters 0 250 500 1%0 PANEL LOCATOR C625 I. 06L0 (due 0380 HIT) • RANELNM PNIMED �rl E NATIONAL HOOD INSURANCE PROGRAM �`uJL•I FLOOD INSIIC' bA OUILU,.1—TY IOWA Mnw, N.ua 'H Q L eNO MNR365DR550 % w U rl N COMMUNITY NUMBER RANEL SUfM WRUWr.cri reeeW Wes auo Q W.MIV 1W]a. Wso r 0 LL O 0 lV Z WRSIONNUMOER 2.63.0 MM'NUMBER 1906100365E MAP REVISED AUGU6T 10, 2021 li „ Kg�AB0.: a9. E'd' •• fi^^ r s w• % �1 tl;�nl4w,q�t ',. � �•� 1 Ilk fij . r 11i� �i,Ra'r _V♦ e� j 'WllALJ,lHf73tl91r' � � .l llkt.JJ j• jj �'. a 16` G I , 1 �w Gt ,•) A 1 h •R_K,rF.TJ!„ yam; in M.futUa �' �I �V I �.� { 9of ��ss � �b �N I � I A W I JT. v FLOOD HAZARD INFORMATION NOTES TO USERS SCALE SUM HE WROAMMIFBERDANOINM W MRRRM MNELUWR THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMATAT HTFPS://MSC.FEMA.GOV -WNhaDA 1,Av'4 Flood Devatlon (B:E) ITIWithout v A y WIM BFE orDeRh--Ae.ne. All vG, Al HWRDMEAS Reguishiryfloodway NALIRDMGg —0.2% Annual Chance Flood HazMd, Areas of 1%annual chance flood with avenge depth less than onefootorwith drainage areas of less than one square mile al Chace ntooa Hazard. Q, , , ®Area with Reduced need Risk due to Levee Seellotes. z„•., OTHER AREAS OF�r�E FLOOD HAZARD Ana whh Flood Risk due to LeMB zw:ep NUSCREEN. Area of Minimal Flood HauI x OTHER AREAS Area of Undetermined Flood Hazard 2-10 GENERAL Channel, Culvaq or Storm Sewer STRUCTURES 1 Rul,,,u,^,,,,^ Levee, DI flootlwel Cross Sectlonswith MAnnual Chance tT'S WMer Surface Elevatlon a. Coastal TranSeet — MD MTran"d Baseline --- Profile Baseline Hydrographic Feature —or— Bess flood Elevatlon Line lBFE) �gEg UnUstudy FEATURES luds0lotloo Boundary re WxKu.mul M tent Imuru,n xM Wp III -- in I w,nM as i'a. MNW xb,k wNnL T. umn n M.W PIRM Paws. . T. MmM PIMC N.unw Pnpml IXP, M gnml wquu uY b Np a.—IM Fx MXµ�YMIM4 P41/xen,uMwM B 11 MW i^M.Y ^WY ix1'M°PnMwH xwa awn I. crI m R.Pen..nua An. wmm a NI. m.p. III a unw aONa. wn a a0ma a a4ma M[W Ywn M weYY. e��PMFIPMIMu WiM n�m.yµM mAM N.ory MmIA�i Re[M.p6MMa Cw�e npMnumM:aM Pp emmuaN M wwlmlM mP ..M. nnr b u, 11. Inwnna " 111 M MI1 wI.fU1. —.IN •=Ivw, Iwwln... h. N—I iwaa hw�r.nPu rraylw�i: all'wo• eMiwm.mna ien0. mu°II.In.—.lZ ,. .. a w lw. ..I 'MM . a nn.x,x M.IxM xax un. ronn Nx,Nen DIaws: werwm wm.mwa: vax.l saw" t XAvo ae N1Inch • 1,DODfeet 1:12,000 0 1,000 2000,4,000 Nat mabn 0 250 500 1,000 PANEL LOCATOR 0np0 • PANEL NOT PRINTED w NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP DUBUUVIE CCOUYNTY, IOWA saw vnxa370a550 i4l \ i 11- DDMMIINR'T NUMBER MNEL WFFIR rUmWF.arva hems ono Wnuous WNT' une. APc I NERSHIN NUMBER 2.4.3.0 MAP NUMBER SBOB1C037OF MAP RENTSED AUGUST 10, 2021 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 16-6-4: FLOOD HAZARD OVERLAY DISTRICT: 16-6-4-1: PURPOSE: The provisions of the flood hazard overlay district are intended to promote the public health, safety, and general welfare and to minimize the extent of floods and the losses incurred in flood hazard areas. The regulations of this section 16-6-4 are designed to: A. Restrict or prohibit uses which are dangerous to health, safety, or property in times of flooding or cause undue increases in flood heights or velocities; B. Require that uses vulnerable to floods, including public facilities which serve such uses, be provided with flood protection at the time of initial construction; C. Protect individuals from buying lands which are unsuited for intended purposes because of flood hazard; and D. Assure that eligibility is maintained for property owners in the city to purchase flood insurance in the national flood insurance program. (Ord. 27-13, 5-20-2013) 16-6-4-2: LANDS TO WHICH REGULATIONS APPLY: This section 16-6-4 shall apply to all lands within the jurisdiction of the city shown on the official zoning map as being within the boundaries of the 100-year floodplain. (Ord. 27-13, 5-20-2013) 16-6-4-3: ESTABLISHMENT OF OFFICIAL FLOODPLAIN ZONING MAP: The official floodplain zoning map, together with all explanatory matter thereon is hereby adopted by reference and declared to be a part of this title. The official zoning map bears the signature of the mayor attested by the city clerk and shall be on file in the office of the planning services department. The flood insurance rate map (FIRM) for Dubuque County and incorporated areas, city of Dubuque, panels 19061C, 0215E, 0217D, 0220E, 0236E, 0237E, 0238E, 0239E, 0241 E, 0330E, 0332E, 0335E, 0351 E, 0352E, 0354E, 0358E, dated October 18, 2011, and panels 0242F, 0243F, 0244F, 0356F, 0360F, dated August 19, 2013, which were prepared as part of the flood insurance study for Dubuque County, are hereby adopted by reference and declared to be the official floodplain zoning map. The flood profiles and all explanatory material contained with the flood insurance study are also declared to be a part of this title. (Ord. 27-13, 5-20-2013) 16-6-4-4: RULES FOR INTERPRETATION OF DISTRICT BOUNDARIES: The boundaries of the zoning district shall be determined by scaling distances on the official floodplain zoning map. Where interpretation is needed as to the exact location of the boundaries of the district as shown on the official zoning map, the city planner shall make the necessary interpretation. The person contesting the location of the district boundary shall be given a reasonable opportunity to present their case and submit technical evidence. (Ord. 27-13, 5-20-2013) 16-6-4-5: COMPLIANCE: No structure or land shall hereafter be used and no structure shall be located, extended, converted or structurally altered to cause a substantial improvement without full compliance with the terms of this title and other applicable regulations which apply to uses within the jurisdiction of this title. Existing structures which suffer substantial damage shall also be required to meet full compliance with the terms of this title should the damaged structure be repaired or rebuilt. (Ord. 27-13, 5-20-2013) 16-6-4-6: ABROGATION AND GREATER RESTRICTIONS: It is not intended by this title to repeal, abrogate or impair any existing easements, covenants, or deed restrictions. However, where this title imposes greater restrictions, the provisions of this title shall prevail. All other ordinances inconsistent with this title are hereby repealed to the extent of the inconsistency only. (Ord. 27-13, 5-20-2013) i[.S;mIM1►1110=10:2 7=111F_%0[eP►A In their interpretation and application, the provisions of this title shall be held to be minimum requirements and shall be liberally construed in favor of the governing body and shall not be deemed a limitation or repeal of any other powers granted by state statutes. (Ord. 27-13, 5-20-2013) 16-6-4-8: WARNING AND LIABILITY DISCLAIMER: The degree of flood protection required by this title is considered reasonable for regulatory purposes and is based on engineering and scientific methods of study. Larger floods may occur on rare occasions. Flood https://export.amIegal.com/api/export-req uests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 1 /12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ heights may be increased by manmade or natural causes, such as ice jams and bridge openings restricted by debris. This title does not imply that areas outside the floodplain districts or land uses permitted within such districts will be free from flooding or flood damages. This title shall not create liability on the part of the city or any officer or employee thereof for any flood damages that result from reliance on this title or any administrative decision lawfully made thereunder. (Ord. 27-13, 5-20-2013) 16-6-4-9: ESTABLISHMENT OF FLOODPLAIN OVERLAY DISTRICTS: The floodplain areas within the jurisdiction of this title are hereby divided into the following districts: A. Floodway Overlay District (FW), Floodway Fringe Overlay District (FF) And General Floodplain Overlay District (FP): The boundaries are shown on the official floodplain zoning map. Within these districts all uses not allowed as permitted uses are prohibited. B. Floodway Overlay District (FW): The floodway overlay district shall be consistent with the boundaries of the floodway as shown on the official floodplain zoning map overlay and indicated on the FIRM maps as zone AE (hatched). C. Floodway Fringe Overlay District (FF): The floodway fringe overlay district shall be those areas shown as floodway fringe on the official floodplain zoning map and indicated on the FIRM maps as zone AE. D. General Floodplain Overlay District (FP): The general floodplain overlay district shall be those areas shown as being within the approximate 100-year flood boundary on the official floodplain zoning map and indicated on the FIRM maps as zone A. (Ord. 27-13, 5-20-2013) 16-6-4-10: FW FLOODWAY OVERLAY DISTRICT: A. Permitted And Conditional Uses: 1. Permitted Uses: The following uses shall be permitted within the FW district to the extent they are not prohibited by any other ordinance (or underlying zoning district) and provided they do not include placement of structures, factory built homes, fill or other obstruction, the storage of materials or equipment, excavation, or alteration of a watercourse: Accessory uses of land for industrial/commercial uses such as loading areas, parking areas, airport landing strips. Agricultural uses such as general farming, pasture, grazing, outdoor plant nurseries, horticulture, viticulture, truck farming, forestry, sod farming, and wild crop harvesting. Private and public recreational uses such as golf courses, tennis courts, ball fields, driving ranges, archery ranges, picnic grounds, transient camping and recreational vehicle facilities, boat launching ramps, swimming areas, parks, wildlife and nature preserves, game farms, fish hatcheries, shooting preserves, target ranges, trap and skeet ranges, hunting and fishing areas, hiking and horseback riding trails. Residential uses of land such as lawns, gardens, parking areas and play areas. Such other open space uses similar in nature to the above uses. 2. Conditional Uses: The following uses which involve structures (temporary or permanent), fill, and storage of materials or equipment may be permitted only upon issuance of a conditional use permit by the zoning board of adjustment as provided for in chapter 8 of this title. Such uses must also meet the applicable provisions of the floodway district performance standards. Circuses, carnivals, and similar transient amusement enterprises. Drive-in theaters, new and used car lots, roadside stands, signs, and billboards. Extraction of sands, gravel, and other materials. Marinas, boat rentals, docks, piers, wharves. Uses or structures accessory to open space uses. Utility transmission lines, underground pipelines. Other uses similar in nature to the above described uses and which are consistent with the general spirit and purposes of this title. https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 2/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ B. Performance Standards: All permitted or conditional uses must be consistent with the need to minimize flood damage and shall meet the following applicable performance standards: 1. No use shall be permitted in the floodway overlay district that would result in any increase in the 100- year flood level. Consideration of the effects of any development on flood levels shall be based upon the assumption that an equal degree of development would be allowed for similarly situated lands. 2. All uses within the floodway overlay district shall: a. Be consistent with the need to minimize flood damage. b. Use construction methods and practices that will minimize flood damage. c. Use construction materials and utility equipment that are resistant to flood damage. 3. No use shall affect the capacity or conveyance of the channel or floodway or any tributary to the main stream, drainage ditch, or any other drainage facility or system. 4. Structures and sanitary and utility systems, if permitted, shall meet the applicable performance standards of the floodway fringe overlay district and shall be constructed or aligned to present the minimum possible resistance to flood flows. 5. Structures, if permitted, shall have a low flood damage potential and shall not be for human habitation. 6. Storage of materials or equipment that are buoyant, flammable, explosive or injurious to human, animal or plant life is prohibited. Storage of other material may be allowed if readily removable from the floodway district within the time available after flood warning. 7. Watercourse alterations or relocations (channel changes and modifications) must be designed to maintain the flood carrying capacity within the altered or relocated portion. In addition, such alterations or relocations must be approved by the IDNR. 8. Any fill allowed in the floodway must be shown to have some beneficial purpose and shall be limited to the minimum amount necessary. 9. Pipeline river or stream crossings shall be buried in the stream bed and banks or otherwise sufficiently protected to prevent rupture due to channel degradation and meandering or due to the action of flood flows. (Ord. 27-13, 5-20-2013) 16-6-4-11: FF FLOODWAY FRINGE OVERLAY DISTRICT: A. Permitted Uses: All uses within the floodway fringe overlay district shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet applicable performance standards of the floodway fringe overlay district. However, on the Mississippi River or on islands therein, no use will be allowed unless identified as not being a floodway area by the IDNR. In which case, if a floodway area is identified, the provisions of the FW floodway overlay district will apply. B. Performance Standards: All uses must be consistent with the need to minimize flood damage and shall meet the following applicable performance standards: 1. All Structures: All structures shall be: a. Adequately anchored to prevent flotation, collapse or lateral movement of the structure; b. Constructed with materials and utility equipment resistant to flood damage; and c. Constructed by methods and practices that minimize flood damage. 2. All New And Substantially Improved Structures: a. Such areas shall be used solely for parking vehicles, building access and low damage potential storage. b. Fully enclosed areas below the "lowest floor" (not including basements) that are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 3/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ c. A minimum of two (2) openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. d. The bottom of all openings shall be no higher than one foot (1') above grade. e. Openings may be equipped with screens, louvers, valves, or other coverings or devices provided they permit the automatic entry and exit of floodwaters. Designs for meeting this requirement must be certified by a professional engineer registered in the state of Iowa. f. New and substantially improved structures must be adequately anchored to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy. Designs for meeting this requirement must be certified by a professional engineer registered in the state of Iowa. g. New and substantially improved structures must be constructed with electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities that are designed and located so as to prevent water from entering or accumulating within the components during conditions of flooding. Designs for meeting this requirement must be certified by a professional engineer registered in the state of Iowa. 3. Residential Buildings: All new or substantially improved residential structures shall have the lowest floor, including basements, elevated a minimum of one foot (1') above the 100-year flood level. Construction shall be upon compacted fill which shall, at all points, be no lower than one foot (1') above the 100-year flood level and extend at such elevation at least eighteen feet (18') beyond the limits of any structure erected thereon. Alternate methods of elevating (such as piers) may be allowed, subject to favorable consideration by the zoning board of adjustment and issuance of a variance, where existing topography, street grades, or other factors preclude elevating by fill. In such cases, the methods used must be adequate to support the structure as well as withstanding the various forces and hazards associated with flooding. All new residential buildings shall be provided with a means of access which will be passable by wheeled vehicles during the 100-year flood. 4. Nonresidential Buildings: All new and substantially improved nonresidential buildings shall have the lowest floor (including basement) elevated a minimum of one foot (1') above the 100-year flood level, or together with attendant utility and sanitary systems, be floodproofed to such a level. When floodproofing is utilized, a professional engineer registered in the state of Iowa shall certify that the floodproofing methods used are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the 100-year flood; and that the structures, below the 100-year flood level, are watertight with walls substantially impermeable to the passage of water. A record of the certification indicating the specific elevation (in relation to North American vertical datum, 1988) to which any structures are floodproofed shall be maintained by the city planner. 5. Factory Built Homes: a. Factory built homes including those placed in existing factory built home parks or subdivisions shall be anchored to resist flotation, collapse, or lateral movement. b. Factory built homes including those placed in existing factory built home parks or subdivisions shall be elevated on a permanent foundation such that the lowest floor of the structure is a minimum of one foot (1') above the 100-year flood level. 6. Utility And Sanitary Systems: a. All new and replacement sanitary sewage systems shall be designed to minimize and eliminate infiltration of floodwaters into the system as well as the discharge of effluent into floodwater. Wastewater treatment facilities shall be provided with a level of flood protection equal to or greater than one foot (1') above the 100-year flood elevation. b. On site waste disposal systems shall be located or designed to avoid impairment to the system or contamination from the system during flooding. c. New or replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the system. Water supply treatment facilities shall be provided with a level of protection equal to or greater than one foot (1') above the 100-year flood elevation. d. Utilities such as gas or electrical systems shall be located and constructed to minimize or eliminate flood damage to the system and the risk associated with such flood damaged or impaired systems. https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 4/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ e. All such systems shall be certified as meeting these requirements by a professional engineer registered in the state of Iowa. 7. Storage: Storage of materials and equipment that are flammable, explosive or injurious to human, animal or plant life is prohibited unless elevated a minimum of one foot (1') above the 100-year flood level. Other material and equipment must either be similarly elevated or: a) not be subject to major flood damage and be anchored to prevent movement due to floodwaters, or b) be readily removable from the area within the time available after flood warning. 8. Flood Control: Flood control structural works such as levees and floodwalls shall provide, at a minimum, protection from a 100-year flood with a minimum of three feet (3') of design freeboard and shall provide for adequate interior drainage. In addition, structural flood control works shall be approved by the IDNR. 9. Capacity And Conveyance Of Channel: No use shall affect the capacity or conveyance of the channel or floodway of any tributary to the main stream, drainage ditch, or other drainage facility or system. 10. Subdivisions: Subdivisions (including factory built home parks and subdivisions) shall be consistent with the need to minimize flood damages and shall have adequate drainage provided to reduce exposure to flood damage. Development associated with subdivision proposals shall meet the applicable performance standards. Subdivision proposals intended for residential development shall provide all lots with a means of vehicular access that will remain dry during occurrence of the 100-year flood. Proposals for subdivisions greater than five (5) acres or fifty (50) lots (whichever is less) shall include 100-year flood elevation data for those areas located within the floodplain (overlay) district. 11. Accessory Structures To Residential Uses: a. Detached garages, sheds, and similar structures that are incidental to a residential use are exempt from the base flood elevation requirements where the following criteria are satisfied. (1) The structure shall be designed to have a low flood damage potential. Its size shall not exceed six hundred (600) square feet in size. Those portions of a structure located less than one (1) foot above the BFE must be constructed of flood -resistant material. (2) The structure shall be used solely for low flood damage potential purposes such as vehicle parking and limited storage. The structure shall not be used for human habitation. (3) The structure shall be constructed and placed on the building site so as to offer minimum resistance to the flow of floodwaters. (4) The structure shall be firmly anchored to resist flotation, collapse and lateral movement. (5) The structure's service facilities such as electrical and heating equipment shall be elevated or floodproofed to at least one (1) foot above the base flood elevation. (6) The structure's walls shall include openings that satisfy the provisions of 16-6-4-11(B) Performance Standards 2. All New And Substantially Improved Structures. b. Exemption from the hundred (100)-year flood elevation requirements for such a structure may result in increased premium rates for flood insurance coverage of the structure and its contents. 12. Recreational Vehicles: a. Recreational vehicles are exempt from the requirements of subsection B5 of this section regarding anchoring and elevation of factory built homes when the following criteria are satisfied: (1) The recreational vehicle shall be located on the site for less than one hundred eighty (180) consecutive days, and (2) The recreational vehicle must be fully licensed and ready for highway use. A recreational vehicle is ready for highway use if it is on its wheels or jacking system and is attached to the site only by quick disconnect type utilities and security devices and has no permanently attached additions. b. Recreational vehicles that are located on the site for more than one hundred eighty (180) consecutive days or are not ready for highway use must satisfy requirements of subsection B5 of this section regarding anchoring and elevation of factory built homes. https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 5/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 13. Pipeline River And Stream Crossings: Pipeline river and stream crossings shall be buried in the stream bed and banks, or otherwise sufficiently protected to prevent rupture due to channel degradation and meandering. (Ord. 27-13, 5-20-2013; amd. Ord. 26-20, 6-15-2020) 16-6-4-12: FP GENERAL FLOODPLAIN OVERLAY DISTRICT: A. Permitted Uses: The following uses shall be permitted within the FP general floodplain overlay district to the extent they are not prohibited by any other ordinance (or underlying zoning district) and provided they do not include placement of structures, factory built homes, fill or other obstruction, the storage of materials or equipment, excavation, or alteration of a watercourse: Accessory uses of land for industrial/commercial uses such as loading areas, parking areas, airport landing strips. Agricultural uses such as general farming, pasture, grazing, outdoor plant nurseries, horticulture, viticulture, truck farming, forestry, sod farming, and wild crop harvesting. Private and public recreation uses such as golf courses, tennis courts, ball fields, driving ranges, archery ranges, picnic grounds, transient camping and recreational vehicle facilities, boat launching ramps, swimming areas, parks, wildlife and nature preserves, game farms, fish hatcheries, shooting preserves, target ranges, trap and skeet ranges, hunting and fishing areas, hiking and horseback riding trails. Residential uses of land such as lawns, gardens, parking areas and play areas. Such other open space uses similar in nature to the above uses. B. Conditional Uses: Any uses which involve placement of structures, factory built homes, fill or other obstructions, the storage of materials or equipment, excavation or alteration of a watercourse may be allowed only upon issuance of a conditional use permit by the zoning board of adjustment. All such uses shall be reviewed by the IDNR to determine: 1) whether the land involved is either wholly or partly within the floodway or floodway fringe, and 2) the 100-year flood level. The applicant shall be responsible for providing the IDNR with sufficient technical information to make the determination. C. Performance Standards: 1. All conditional uses, or portions thereof, to be located in the floodway as determined by the IDNR shall meet the applicable provisions and standards of the floodway overlay district. 2. All conditional uses, or portions thereof, to be located in the floodway fringe as determined by the IDNR shall meet the applicable standards of the floodway fringe overlay district. (Ord. 27-13, 5-20-2013) 16-6-4-13: FLOODPLAIN OVERLAY DISTRICT ADMINISTRATION: A. Appointment, Duties And Responsibilities Of City Planner: 1. A city planner designated by the city manager shall administer and enforce this title and will herein be referred to as the administrator. 2. Duties and responsibilities of the administrator shall include, but not necessarily be limited to, the following: a. Review all floodplain development permit applications to ensure that the provisions of this title will be satisfied. b. Review all floodplain development permit applications to ensure that all necessary permits have been obtained from federal, state or local governmental agencies. c. Record and maintain a record of: 1) the elevation (in relation to North American vertical datum, 1988) of the lowest floor of all new or substantially improved structures, or 2) the elevation to which new or substantially improved structures have been floodproofed. d. Notify adjacent communities and/or counties and the IDNR prior to any proposed alteration or relocation of a watercourse and submit evidence of such notifications to the federal insurance administrator. e. Keep a record of all permits, conditional uses, appeals, variances and such other transactions and correspondence pertaining to the administration of this title. https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 6/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ f. Submit to the federal insurance administrator an annual report concerning the city's participation in the national flood insurance program, utilizing the annual report form supplied by the federal insurance administrator. g. Notify the federal insurance administration of any annexations or modifications to the city's boundaries as part of the annual report. h. Review subdivision proposals to ensure such proposals are consistent with the purpose of this title and advise the city council of potential conflicts. B. Floodplain Development Permit: 1. Permit Required: A floodplain development permit issued by the administrator shall be secured prior to initiation of any floodplain development (any manmade change to improved or unimproved real estate, including, but not limited to, buildings or other structures, mining, filling, grading, paving, excavation or drilling operations) including the placement of factory built homes in both the floodway, floodway fringe and general floodplain overlay districts. 2. Application For Permit: Application for a floodplain development permit shall be made on forms supplied by the administrator and shall include the following information: a. Description of and plans for the work to be covered by the permit for which application is to be made. b. Description of the land on which the proposed work is to be done (i.e., lot, block, tract, street address or similar description) that will readily identify and locate the work to be done. c. Identification of the use or occupancy for which the proposed work is intended. d. Elevation of the 100-year flood. e. Elevation (in relation to North American vertical datum, 1988) of the lowest floor (including basement) of the structure or of the level to which a structure is to be floodproofed. f. For structures being improved or rebuilt, the estimated cost of improvements and market value of the structure prior to the improvements. g. All certifications by a professional engineer registered in the state of Iowa as required by this code. h. Such other information as the administrator deems reasonably necessary for the purpose of this title. 3. Action For Permit Application: The administrator shall make a determination as to whether the proposed floodplain development meets the applicable provisions and standards of this title and shall approve or disapprove the application. For disapprovals, the applicant shall be informed, in writing, of the specific reasons therefor. The administrator shall not issue permits for conditional uses or variances except as directed by the zoning board of adjustment. 4. As Built Certification: The applicant shall be required, prior to the use or occupancy of any structure or development, to submit certification by a professional engineer registered in the state of Iowa that the work authorized by the floodplain development permit was accomplished in compliance with this title. Any use, arrangement, or construction in conflict with that authorized shall be deemed a violation of this title. (Ord. 27-13, 5-20-2013) 16-6-4-14: ZONING BOARD OF ADJUSTMENT ACTION AUTHORIZED: A. Hearing: The zoning board of adjustment shall hear and decide applications for conditional uses, appeals and variances. B. Conditional Uses: Requests for conditional uses shall be submitted to the administrator, who shall forward such to the board for consideration. Such requests shall include information ordinarily submitted with applications as well as any additional information deemed necessary by the board. C. Appeals: Where it is alleged there is any error in any order, requirement, decision, or determination made by an administrative official in the enforcement of this title, the aggrieved party may appeal such action. The notice of appeal shall be filed with the board and with the official from whom the appeal is taken and shall set forth the specific reason for the appeal. The official from whom the appeal is taken shall transmit to the board all the papers constituting the record upon which the action appealed from was taken. https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 7/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ D. Variances: The board may authorize, upon request in specific cases, such variances from the terms of this title that will not be contrary to the public interest, where owing to special conditions a literal enforcement of the provisions of this title will result in unnecessary hardship. Variances granted must meet the following applicable standards: 1. No variances shall be granted for any development within the floodway overlay district which would result in any increase in the 100-year level. Consideration of the effects of any development on flood levels shall be based upon the assumption that an equal degree of development would be allowed for similarly situated lands. 2. Variances shall only be granted upon: a) a showing of good and sufficient cause, b) a determination that failure to grant the variance would result in exceptional hardship to the applicant, and c) a determination that the granting of the variance will not result in increased flood heights, additional threats to public safety, or extraordinary public expense, create nuisances, or cause fraud on or victimization of the public. 3. A variance shall only be granted upon a determination that the variance is the minimum necessary considering the flood hazard, to afford relief. 4. In cases where the variance involves a lower level of flood protection for structures than what is ordinarily required by this title, the applicant shall be notified in writing over the signature of the administrator that: a) the issuance of a variance will result in increased premium rates for flood insurance, and b) such construction increases risks to life and property. 5. All variances granted shall have the concurrence or approval of the IDNR. E. Board Decisions: In passing upon requests for conditional uses and variances, the board shall consider all relevant factors specified in other sections of this title and: 1. The danger to life and property due to increased flood heights or velocities caused by encroachments. 2. The danger that materials may be swept onto other lands or downstream to the injury of others. 3. The proposed water supply and sanitation systems and the ability of these systems to prevent disease, contamination and unsanitary conditions. 4. The susceptibility of the proposed facility and its contents to flood damage and the effect of such damage on the individual owner. 5. The importance of the services provided by the proposed facility to the community. 6. The requirements of the facility for a floodplain location. 7. The availability of alternative locations not subject to flooding for the proposed use. 8. The compatibility of the proposed use with existing development and development anticipated in the foreseeable future. 9. The relationship of the proposed use to the comprehensive plan and floodplain management program for the area. 10. The safety of access to the property in times of flood for ordinary and emergency vehicles. 11. The expected heights, velocity, duration, rate of rise and sediment transport of the floodwater expected at the site. 12. Such other factors which are relevant to the purpose of this title. F. Conditions Attached To Conditional Uses Or Variances: Upon consideration of the factors listed above, the board may attach such conditions to the granting of conditional uses and variances as it deems necessary to further the purpose of this title. Such conditions may include, but not necessarily be limited to: 1. Modification of waste disposal and water supply facilities; 2. Limitation on periods of use and operation; 3. Imposition of operational controls, sureties and deed restrictions; https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 8/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 4. Requirements for construction of channel modification, dikes, levees, and other protective measures, provided such are approved by the IDNR and are deemed the only practical alternative to achieving the purposes of this title; and 5. F000dproofing measures which shall be designed consistent with the flood protection elevation for the particular area, flood velocities, durations, rate of rise, hydrostatic and hydrodynamic forces, and other factors associated with the regulatory flood and that the applicant submit a plan or document certified by a professional engineer registered in the state of Iowa that the floodproofing measures are consistent with the regulatory flood protection elevation and associated flood factors for the particular area. (Ord. 27-13, 5-20-2013) 16-6-4-15: DEFINITIONS: Unless specifically defined below or in chapter 2 of this title, words or phrases used in this section 16-6-4 shall be interpreted so as to give them the meaning they have in common usage and to give this section 16-6-4 its most reasonable application. APPURTENANT STRUCTURE: A structure which is on the same parcel of the property as the principal structure to be insured and the use of which is incidental to the use of the principal structure. BASE FLOOD: The flood having one percent (1 %) chance of being equaled or exceeded in any given year (see definition of 100-Year Flood). BASE FLOOD ELEVATION: The elevation floodwaters would reach at a particular site during the occurrence of a base flood event. BASEMENT: Any enclosed area of a structure which has its floor or lowest level below ground level (subgrade) on all sides. See also definition of Lowest Floor. DEVELOPMENT: Any manmade change to improved or unimproved real estate, including, but not limited to, buildings or other structures, the storage of equipment or materials, mining, dredging, filling, grading, paving, excavation or drilling operations. EXISTING CONSTRUCTION: Any structure for which the "start of construction" commenced before the effective date of the first floodplain management regulations adopted by the community on April 16, 1990. May also be referred to as "existing structure". EXISTING FACTORY BUILT HOME PARK OR SUBDIVISION: A factory built home park or subdivision for which the construction of facilities for servicing the lots on which the factory built homes are to be affixed (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed before the effective date of the first floodplain management regulations adopted by the community on April 16, 1990. EXPANSION OF EXISTING FACTORY BUILT HOME PARK OR SUBDIVISION: The preparation of additional sites by the construction of facilities for servicing the lots on which the factory built homes are to be affixed (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads). FACTORY BUILT HOME: Any structure, designed for residential use, which is wholly or in substantial part, made, fabricated, formed or assembled in manufacturing facilities for installation or assembly and installation on a building site. For the purpose of this section 16-6-4, factory built homes include mobile homes, manufactured homes and modular homes and also include park trailers, travel trailers and other similar vehicles placed on a site for greater than one hundred eighty (180) consecutive days. FACTORY BUILT HOME PARK: A parcel or contiguous parcels of land divided into two (2) or more factory built home lots for rent or sale. FLOOD: A general or temporary condition of partial or complete inundation of normally dry land areas resulting from the overflow of streams or rivers or from the unusual and rapid runoff of surface waters from any source. FLOOD ELEVATION: The elevation floodwaters would reach at a particular site during the occurrence of a specific flood. For instance, the 100-year flood elevation is the elevation of floodwaters related to the occurrence of the 100-year flood. FLOOD INSURANCE RATE MAP: The official map prepared as part of (but published separately from) the flood insurance study which delineates both the flood hazard areas and the risk premium zones applicable to https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 9/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ the community. FLOOD INSURANCE STUDY: An examination, evaluation and determination of flood hazards and, if appropriate, corresponding water surface elevations. FLOODPLAIN: Any land area susceptible to being inundated by water as a result of a flood. FLOODPLAIN MANAGEMENT: An overall program of corrective and preventive measures for reducing flood damages and promoting the wise use of floodplains, including, but not limited to, emergency preparedness plans, flood control works, floodproofing and floodplain management regulations. FLOODPROOFING: Any combination of structure and nonstructural additions, changes, or adjustments to structures, including utility and sanitary facilities, which will reduce or eliminate flood damage to such structures. FLOODWAY: The channel of a river or stream, and those portions of the floodplains adjoining the channel, which are reasonably required to carry and discharge floodwaters or flood flows so that confinement of flood flows to the floodway area will not result in substantially higher flood levels or flow velocities. FLOODWAY FRINGE: Those portions of the floodplain, other than the floodway, which can be filled, leveed, or otherwise obstructed without causing substantially higher flood levels or flow velocities. HIGHEST ADJACENT GRADE: The highest natural elevation of the ground surface prior to construction next to the proposed walls of a structure. HISTORIC STRUCTURE: Any structure that is: A. Listed individually in the national register of historic places, maintained by the department of interior, or preliminarily determined by the secretary of the interior as meeting the requirements for individual listing on the national register; B. Certified or preliminarily determined by the secretary of the interior as contributing to the historical significance of a registered historic district or a district preliminarily determined by the secretary to qualify as a registered historic district; C. Individually listed on a state inventory of historic places in states with historic preservation programs which have been approved by the secretary of the interior; or D. Individually listed on a local inventory of historic places in communities with historic preservation programs that have been certified by either: 1) an approved state program as determined by the secretary of the interior, or 2) directly by the secretary of the interior in states without approved programs. LOWEST FLOOR: The floor of the lowest enclosed area in a structure, including a basement, except when all the following criteria are met: A. The enclosed area is designated to satisfy the provisions of subsection 16-6-4-11 B4 of this chapter; and B. The enclosed area is unfinished (not carpeted, drywalled, etc.) and used solely for low damage potential uses such as building access, parking or storage; and C. Machinery and service facilities (e.g., hot water heater, furnace, electrical service) contained in the enclosed area are located at least one foot (1') above the 100-year flood level; and D. The enclosed area is not a "basement" as defined in this section. In cases where the lowest enclosed area satisfies subsections A, B, C, and D of this definition, the lowest floor is the floor of the next highest enclosed area that does not satisfy the criteria above. MINOR PROJECTS: Small development activities (except for filling, grading and excavating) valued at less than five hundred dollars ($500.00). NEW CONSTRUCTION: Those structures or development for which the start of construction commenced on or after the effective date of the flood insurance rate map (September 6, 1989). NEW FACTORY BUILT HOME PARK OR SUBDIVISION: A factory built home park or subdivision for which the construction of facilities for servicing the lots on which the factory built homes are to be affixed (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 10/12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ concrete pads) is completed on or after the effective date of the first floodplain management regulations adopted by the community on April 16, 1990. 100-YEAR FLOOD: A flood, the magnitude of which has a one percent (1 %) chance of being equaled or exceeded in any given year or which, on the average, will be equaled or exceeded at least once every one hundred (100) years. RECREATIONAL VEHICLE: A vehicle which is: A. Built on a single chassis; B. Four hundred (400) square feet or less when measured at the largest horizontal projection; C. Designed to be self-propelled or permanently towable by a light duty truck; and D. Designed primarily not for use as a permanent dwelling but as a temporary living quarters for recreational, camping, travel, or seasonal use. ROUTINE MAINTENANCE OF EXISTING BUILDINGS AND FACILITIES: Repairs necessary to keep a structure in a safe and habitable condition, provided they are not associated with a general improvement of the structure or repair of a damaged structure. Such repairs include: A. Normal maintenance of structures such as reroofing, replacing roofing tiles and replacing siding; B. Exterior and interior painting, papering, tiling, carpeting, cabinets, countertops and similar finish work; C. Basement sealing; D. Repairing or replacing damaged or broken windowpanes; E. Repairing plumbing systems, electrical systems, heating or air conditioning systems and repairing wells or septic systems. SPECIAL FLOOD HAZARD AREA: The land within a community subject to the 100-year flood. This land is identified as zone A on the community's flood insurance rate map. START OF CONSTRUCTION: Includes substantial improvement, and means the date the development permit was issued, provided the actual start of construction, repair, reconstruction, rehabilitation, addition, placement, or other improvement, was within one hundred eighty (180) days of the permit date. The actual start means either the first placement or permanent construction of a structure on a site, such as pouring of a slab or footings, the installation of pile, the construction of columns, or any work beyond the stage of excavation; or the placement of a factory built home on a foundation. Permanent construction does not include land preparation, such as cleaning, grading or filling, nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footings, piers, or foundations, or the erection of temporary forms; nor does it include the installation on the property of accessory buildings such as garages or sheds not occupied as dwelling units or not part of the main structure. For a substantial improvement, the actual start of construction means the first alteration of any wall, ceiling, floor, or other structural part of the building, whether or not that alteration affects the external dimension of the building. STRUCTURE: Anything constructed or erected on the ground or attached to the ground, including, but not limited to, buildings, factories, sheds, cabins, factory built homes, storage tanks, and other similar uses. SUBSTANTIAL DAMAGE: Damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damaged condition would equal or exceed fifty percent (50%) of the market value of the structure before the damage occurred. SUBSTANTIAL IMPROVEMENT: Any improvement to a structure which satisfies either of the following criteria: A. Any repair, reconstruction, rehabilitation, addition or improvement of a structure, the cost of which would equal or exceed fifty percent (50%) of the market value of the structure either: 1) before the improvement or repair is started, or 2) if the structure has been damaged, and was being restored, before the damage occurred. For the purposes of this definition, "substantial improvement" is considered to occur when the first alteration affects the external dimensions of the structure. This term does not, however, include any project for improvement of a structure to comply with existing state or local health, sanitary, or safety code specifications which are solely necessary to assure safe conditions for the existing use. https://export.amIegal.com/api/export-req uests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 11 /12 6/9/2021 https://export.amlegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ B. Any addition which increases the original floor area of a building by twenty five percent (25%) or more. All additions constructed after September 6, 1989, shall be added to any proposed addition in determining whether the total increase in original floor space would exceed twenty five percent (25%). VARIANCE: A grant of relief by a community from the terms of the floodplain management regulations as defined in this section 16-6-4. VIOLATION: The failure of a structure or other development to be fully compliant with the community's floodplain management regulations. (Ord. 27-13, 5-20-2013; amd. Ord. 26-20, 6-15-2020) https://export.amIegal.com/api/export-requests/b682be9c-bf55-4b75-8003-d94088477797/downIoad/ 12/12 Flood Hazard Overlay Major Ordinance Changes PREVIOUS LANGUAGE NEW LANGUAGE BASE FLOOD: The flood having one percent (1 %) chance of being equaled or exceeded in any given year (see definition of 100-Year Flood). BASE FLOOD - The flood having one (1) percent chance of being equaled or exceeded in any given year. (Also commonly referred to as the 100-year flood"). BASE FLOOD ELEVATION: The elevation floodwaters would reach at a particular site during the occurrence of a base flood event. BASE FLOOD ELEVATION (BFE) - The elevation floodwaters would reach at a particular site during the occurrence of a base flood event. FLOODWAY: The channel of a river or stream, and those portions of the floodplains adjoining the channel, which are reasonably required to carry and discharge floodwaters or flood flows so that confinement of flood flows to the floodway area will not result in substantially higher flood levels or flow velocities. FLOODWAY - The channel of a river or stream and those portions of the floodplains adjoining the channel, which are reasonably required to carry and discharge flood waters or flood flows so that confinement of flood flows to the floodway area will not cumulatively increase the water surface elevation of the base flood by more than one (1) foot. FLOODWAY FRINGE: Those portions of the floodplain, other than the floodway, which can be filled, leveed, or otherwise obstructed without causing substantially higher flood levels or flow velocities. FLOODWAY FRINGE - Those portions of the Special Flood Hazard Area outside the floodway. LOWEST FLOOR: The floor of the lowest enclosed area in a structure, including a basement, except when all the following criteria are met: A. The enclosed area is designated to satisfy the provisions of subsection 16-6-4-11 B4 of this chapter; and B. The enclosed area is unfinished (not carpeted, drywalled, etc.) and used solely for low damage potential uses such as building access, parking or storage; and C. Machinery and service facilities (e.g., hot water heater, furnace, electrical service) contained in the enclosed area are located at least one foot (1') above the 100-year flood level; and D. The enclosed area is not a "basement" as defined in this section. In cases where the lowest enclosed area satisfies subsections A, B, C, and D of this definition, the lowest floor is the floor of the next highest enclosed area that does not satisfy the criteria above. LOWEST FLOOR - The floor of the lowest enclosed area in a building including a basement except when the criteria listed in the definition of Enclosed Area below Lowest Floor are met. FLOOD INSURANCE STUDY: An examination, evaluation and determination of flood hazards and, if appropriate, corresponding water surface elevations. FLOOD INSURANCE STUDY (FIS) - A report published by FEMA for a community issued along with the community's Flood Insurance Rate Map(s). The study contains such background data as the base flood discharge and water surface elevations that were used to prepare the FIRM. SPECIAL FLOOD HAZARD AREA: The land within a community subject to the 100-year flood. This land is identified as zone A on the community's flood insurance rate map. SPECIAL FLOOD HAZARD AREA (SFHA) - The land within a community subject to the "base flood". This land is identified on the community's Flood Insurance Rate Map as Zone A, A11-30, AE, AH, AO, AR, and/or A99. SUBSTANTIAL DAMAGE: Damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damaged condition would equal or exceed fifty percent (50%) of the market value of the structure before the damage occurred. SUBSTANTIAL DAMAGE - Damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damage condition would equal or exceed fifty (50) percent of the market value of the structure before the damage occurred. Volunteer labor and donated materials shall be included in the estimated cost of repair. SUBSTANTIAL IMPROVEMENT: Any improvement to a structure which satisfies either of the following criteria: A. Any repair, reconstruction, rehabilitation, addition or improvement of a structure, the cost of which would equal or exceed fifty percent (50%) of the market value of the structure either: 1) before the improvement or repair is started, or 2) if the structure has been damaged, and was being restored, before the damage occurred. For the purposes of this definition, "substantial improvement" is considered to occur when the first alteration affects the external dimensions of the structure. This term does not, however, include any project for improvement of a structure to comply with existing state or local health, sanitary, or safety code specifications which are solely necessary to assure safe conditions for the existing use. B. Any addition which increases the original floor area of a building by twenty five percent (25%) or more. All additions constructed after September 6, 1989, shall be added to any proposed addition in determining whether the total increase in original floor space would exceed twenty five percent (25%). SUBSTANTIAL IMPROVEMENT - Any improvement to a structure which satisfies either of the following criteria: A. Any repair, reconstruction, or improvement of a structure, the cost of which equals or exceeds fifty (50) percent of the market value of the structure either (i) before the "start of construction" of the improvement, or (ii) if the structure has been "substantially damaged" and is being restored, before the damage occurred. The term does not, however, include any project for improvement of a structure to correct existing violations of state or local health, sanitary, or safety code specifications which have been identified by the local code enforcement official and which are the minimum necessary to assure safe living conditions. The term also does not include any alteration of an "historic structure", provided the alteration will not preclude the structure's designation as an "historic structure". B. Any addition which increases the original floor area of a building by 25 percent or more. All additions constructed after the effective date of April 16, 1990 of which the first floodplain management regulations were adopted by the community shall be added to any proposed addition in determining whether the total increase in original floor space would exceed 25 percent. ESTABLISHMENT OF OFFICIAL FLOODPLAIN ZONING MAP: The official floodplain zoning map, together with all explanatory matter thereon is hereby adopted by reference and declared to be a part of this title. The official zoning map bears the signature of the mayor attested by the city clerk and shall be on file in the office of the planning services department. The flood insurance rate map (FIRM) for Dubuque County and incorporated areas, city of Dubuque, panels 19061 C, 0215E, 0217D, 0220E, 0236E, 0237E, 0238E, 0239E, 0241 E, 0330E, 0332E, 0335E, 0351 E, 0352E, 0354E, 0358E, dated October 18, 2011, and panels 0242F, 0243F, 0244F, 0356F, 0360F, dated August 19, 2013, which were prepared as part of the flood insurance study for Dubuque County, are hereby adopted by reference and declared to be the official floodplain zoning map. The flood profiles and all explanatory material contained with the flood insurance study are also declared to be a part of this title. ESTABLISHMENT OF OFFICIAL FLOODPLAIN ZONING MAP The Flood Insurance Rate Map (FIRM) for Dubuque County and Incorporated Areas, City of Dubuque, Panels 19061CO215F, 0217F, 0220F, 0236F, 0237F, 0238F, 0239F, 0241F, 0330F, 0332F, 0335F, 0351F, 0352F, 0354F, 0358F, 0365F, 0370F, dated August 10t", 2021, and Panels 19061 CO242F, 0243F, 0244F, 0356F, 0360F, dated August 19t", 2013 which were prepared as part of the Flood Insurance Study for Dubuque County, is (are) hereby adopted by reference and declared to be the Official Floodplain Zoning Map. The flood profiles and all explanatory material contained with the Flood Insurance Study are also declared to be a part of Section 16-6-4. WARNING AND LIABILITY DISCLAIMER: The degree of flood protection required by this title is considered reasonable for regulatory purposes and is based on engineering and scientific methods of study. Larger floods may occur on rare occasions. Flood heights may be increased by manmade or natural causes, such as ice jams and bridge openings restricted by debris. This title does not imply that areas outside the floodplain districts or land uses permitted within such districts will be free from flooding or flood damages. This title shall not create liability on the part of the city or any officer or employee thereof for any flood damages that result from reliance on this title or any administrative decision lawfully made thereunder. WARNING AND DISCLAIMER OF LIABILITY The standards required by Section 16-6-4 are considered reasonable for regulatory purposes. Section 16-6-4 does not imply that areas outside the designated Floodplain (Overlay) District areas will be free from flooding or flood damages. Section 16-6-4 shall not create liability on the part of the City of Dubuque or any officer or employee thereof for any flood damages that result from reliance on Section 16-6-4 or any administrative decision lawfully made there under. FW FLOODWAY OVERLAY DISTRICT: A. Permitted And Conditional Uses: 1. Permitted Uses: The following uses shall be permitted within the FW district to the extent they are not prohibited by any other ordinance (or underlying zoning district) and provided they do not include placement of structures, factory built homes, fill or other obstruction, the storage of materials or equipment, excavation, or alteration of a watercourse: Accessory uses of land for industrial/commercial uses such as loading areas, parking areas, airport landing strips. Agricultural uses such as general farming, pasture, grazing, outdoor plant nurseries, horticulture, viticulture, truck farming, forestry, sod farming, and wild crop harvesting. Private and public recreational uses such as golf courses, tennis courts, ball fields, driving ranges, archery ranges, picnic grounds, transient camping and recreational vehicle facilities, boat launching ramps, swimming areas, parks, wildlife and nature preserves, game farms, fish hatcheries, shooting preserves, target ranges, trap and skeet ranges, hunting and fishing areas, hiking and horseback riding trails. Residential uses of land such as lawns, gardens, parking areas and play areas. Such other open space uses similar in nature to the above uses. 2. Conditional Uses: The following uses which involve structures (temporary or permanent), fill, and storage of materials or equipment may be permitted only upon issuance of a conditional use permit by the zoning board of adjustment as provided for in chapter 8 of this title. Such uses must also meet the applicable provisions of the floodway district performance standards. Circuses, carnivals, and similar transient amusement enterprises. Drive-in theaters, new and used car lots, roadside stands, signs, and billboards. Extraction of sands, gravel, and other materials. Marinas, boat rentals, docks, piers, wharves. Uses or structures accessory to open space uses. Utility transmission lines, underground pipelines. Other uses similar in nature to the above described uses and which are consistent with the general spirit and purposes of this title. FLOODWAY (OVERLAY) DISTRICT (FW): 1. Permitted Uses All development within the Floodway District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet applicable performance standards of the Floodway District. FP GENERAL FLOODPLAIN OVERLAY DISTRICT: A. Permitted Uses: The following uses shall be permitted within the FP general floodplain overlay district to the extent they are not prohibited by any other ordinance (or underlying zoning district) and provided they do not include placement of structures, factory built homes, fill or other obstruction, the storage of materials or equipment, excavation, or alteration of a watercourse: Accessory uses of land for industrial/commercial uses such as loading areas, parking areas, airport landing strips. Agricultural uses such as general farming, pasture, grazing, outdoor plant nurseries, horticulture, viticulture, truck farming, forestry, sod farming, and wild crop harvesting. Private and public recreation uses such as golf courses, tennis courts, ball fields, driving ranges, archery ranges, picnic grounds, transient camping and recreational vehicle facilities, boat launching ramps, swimming areas, parks, wildlife and nature preserves, game farms, fish hatcheries, shooting preserves, target ranges, trap and skeet ranges, hunting and fishing areas, hiking and horseback riding trails. Residential uses of land such as lawns, gardens, parking areas and play areas. Such other open space uses similar in nature to the above uses. B. Conditional Uses: Any uses which involve placement of structures, factory built homes, fill or other obstructions, the storage of materials or equipment, excavation or alteration of a watercourse may be allowed only upon issuance of a conditional use permit by the zoning board of adjustment. All such uses shall be reviewed by the IDNR to determine: 1) whether the land involved is either wholly or partly within the floodway or floodway fringe, and 2) the 100-year flood level. The applicant shall be responsible for providing the IDNR with sufficient technical information to make the determination. GENERAL FLOODPLAIN (OVERLAY) DISTRICT (GF): 1. Permitted Uses A. All development within the General Floodplain District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet the applicable performance standards of the General Floodplain District. B. Any development which involves placement of structures, factory -built homes, fill or other obstructions, storage of materials or equipment, excavation or alteration of a watercourse shall be reviewed by the Department of Natural Resources to determine (i) whether the land involved is either wholly or partly within the floodway or floodway fringe and (ii) the base flood elevation. The applicant shall be responsible for providing the Department of Natural Resources with sufficient technical information to make the determination. C. Review by the Iowa Department of Natural Resources is not required for the proposed construction of new or replacement bridges or culverts where: 1) The bridge or culvert is located on a stream that drains less than two (2) square miles, and 2) The bridge or culvert is not associated with a channel modification that constitutes a channel change as specified in 567-71.2(2), Iowa Administrative Code. Flood Hazard Overlay Major Ordinance Changes New Additional Language ENCLOSED AREA BELOW LOWEST FLOOR - The floor of the lowest enclosed area in a building when all the following criteria are met: A. The enclosed area is designed to flood to equalize hydrostatic pressure during flood events with walls or openings that satisfy the provisions of Section 16-6-4- 7(2)(D)(1) of Title 16, and B. The enclosed area is unfinished (not carpeted, drywalled, etc.) and used solely for low damage potential uses such as building access, parking or storage, and C. Machinery and service facilities (e.g., hot water heater, furnace, electrical service) contained in the enclosed area are located at least one (1) foot above the base flood elevation, and D. The enclosed area is not a "basement" as defined in this section. FIVE HUNDRED (500) YEAR FLOOD - A flood, the magnitude of which has a two -tenths (0.2) percent chance of being equaled or exceeded in any given year or which, on average, will be equaled or exceeded at least once every five hundred (500) years. MAXIMUM DAMAGE POTENTIAL DEVELOPMENT - Hospitals and like institutions; buildings or building complexes containing documents, data, or instruments of great public value; buildings or building complexes containing materials dangerous to the public or fuel storage facilities; power installations needed in emergency or other buildings or building complexes similar in nature or use. 16-6-4-2: STATUTORY AUTHORITY, FINDINGS OF FACT AND PURPOSE: 1. The Legislature of the State of Iowa has in Chapter 414, Code of Iowa, as amended, delegated the power to cities to enact zoning regulations to secure safety from flood and to promote health and the general welfare. 2. Findings of Fact A. The flood hazard areas of the City of Dubuque are subject to periodic inundation which can result in loss of life and property, health and safety hazards, disruption of commerce and governmental services, extraordinary public expenditures for flood protection and relief, and impairment of the tax base all of which adversely affect the public health, safety and general welfare of the community. B. These flood losses, hazards, and related adverse effects are caused by: (i) The occupancy of flood hazard areas by uses vulnerable to flood damages which create hazardous conditions as a result of being inadequately elevated or otherwise protected from flooding and (ii) the cumulative effect of obstructions on the floodplain causing increases in flood heights and velocities. C. Section 16-6-4 relies upon engineering methodology for analyzing flood hazards which is consistent with the standards established by the Department of Natural Resources. Floodway Fringe (Overlay) District FF Performance Standards N. Maximum Damage Potential Development - All new or substantially improved maximum damage potential development shall have the lowest floor (including basement) elevated a minimum of one (1) foot above the elevation of the 500-year flood, or together with attendant utility and sanitary systems, be floodproofed to such a level. When floodproofing is utilized, a professional engineer registered in the State of Iowa shall certify that the floodproofing methods used are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the 0.2% annual chance flood; and that the structure, below the 0.2% annual chance flood elevation is watertight with walls substantially impermeable to the passage of water. A record of the certification indicating the specific elevation (in relation to North American Vertical Datum 1988) to which any structures are floodproofed shall be maintained by the Administrator. Where 0.2% chance flood elevation data has not been provided in the Flood Insurance Study, the Iowa Department of Natural Resources shall be contacted to compute such data. The applicant will be responsible for providing the Department of Natural Resources with sufficient technical information to make such determinations. NONCONFORMING USES: 1. A structure or the use of a structure or premises which was lawful before the passage or amendment of Section 16-6-4, but which is not in conformity with the provisions of Section 16-6-4, may be continued subject to the following conditions: A. If such use is discontinued for six (6) consecutive months, any future use of the building premises shall conform to Section 16-6-4. B. Uses or adjuncts thereof that are or become nuisances shall not be entitled to continue as nonconforming uses. C. If any nonconforming use or structure is destroyed by any means, including flood, it shall not be reconstructed if the cost is more than fifty (50) percent of the market value of the structure before the damage occurred, unless it is reconstructed in conformity with the provisions of Section 16-6-4. This limitation does not include the cost of any alteration to comply with existing state or local health, sanitary, building or safety codes or regulations or the cost of any alteration of a structure listed on the National Register of Historic Places, provided that the alteration shall not preclude its continued designation. 2. Except as provided in Section 16-6-4-10(1)(B), any use which has been permitted as a Variance shall be considered a conforming use. PENALTIES FOR VIOLATION: Violations of the provisions of Unified Development Code Section 16-6-4 or failure to comply with any of the requirements (including violations of conditions and safeguards established in connection with grants of Variances) shall constitute a misdemeanor. Any person who violates Section 16-6-4 or fails to comply with any of its requirements shall upon conviction thereof be fined not more than $500.00 (FIVE HUNDRED DOLLARS) or imprisoned for not more than 30 (THIRTY) days. Each day such violation continues shall be considered a separate offense. Nothing herein contained prevent the City of Dubuque from taking such other lawful action as is necessary to prevent or remedy violation. AMENDMENTS: The regulations and standards set forth in Unified Development Code Section 16-6-4 may from time to time be amended, supplemented, changed, or repealed. No amendment, supplement, change, or modification shall be undertaken without prior approval of the Department of Natural Resources. SEVERABILITY If any section, clause, provision or portion of Section 16-6-4 is adjudged unconstitutional or invalid by a court of competent jurisdiction, the remainder of Section 16-6-4 shall not be affected thereby. THE C DUUB4QTE Masterpiece on the Mississippi TO: Zoning Advisory Commission j FROM: Wally Wernimont, Planning Services Manager DATE: May 27, 2021 Dubuque All -America City 2007-2012.2013 2017*2019 RE: To Amend Section 6-4 Flood Hazard Overlay District of the Unified Development Code INTRODUCTION The City of Dubuque has received new flood plain maps from the Federal Emergency Management Agency (FEMA) that will go into effect August 10, 2021. City Planning staff has been working with FEMA representatives and Iowa Department of Natural Resources (IDNR) staff for approximately three years in an effort to have the most accurate flood maps possible for the City of Dubuque. As part of receiving new flood maps, the City must officially adopt the new maps as part of our flood plain overlay district regulations. BACKGROUND During the flooding of 2008, the State of Iowa became aware of the need for up-to-date flood risk data for emergency response and flood preparation for communities. Nearly a third of the counties in the state were without Flood Insurance Rate Maps (FIRMs) while nearly half were working with data that was 20 - 30 years old. This data was out of date due to development, changes on the landscape and increases in stream gage (flow) information. This made growth difficult for those communities with older mapping as it was unreliable for permitting and floodplain management. The Iowa Department of Natural Resources responded to this need by applying for a Housing and Urban Development (HUD) grant and began responding to the lack of flood risk data with the initiation of the Statewide Floodplain Mapping Program in 2010. This was possible because Iowa had already begun collecting Light Detection and Ranging (LiDAR) contour data in 2007. Collection of LiDAR data was completed in 2010. The Federal Emergency Management Agency (FEMA) requires LiDAR for all new regulatory mapping. Ten years later the main goal of this program, to provide digital flood risk data and updated mapping based on LiDAR to all communities in the state, is nearing completion. Preliminary mapping has been completed for all county -wide FIRMs for the entire state including Dubuque County. DISCUSSION The City of Dubuque Flood Plain Regulations were first adopted in 1978. In the late 1980's, the Iowa Department of Natural Resources was in the process of transferring Amend Section 6-4 Flood Hazard Overlay District Page 2 some of the responsibility for enforcement of flood plain management regulations to cities across the state. A model floodplain ordinance was created by the IDNR. Since the model ordinance adoption in 1990, the City of Dubuque has made changes to the flood plain development regulations periodically as required by FEMA. FEMA has informed the City that as part of receiving the new flood maps, that they must be officially adopted by Ordinance prior to the effective date of the new flood plain maps, which is August 10, 2021. Planning staff has worked with IDNR staff and FEMA Region VI staff to make the necessary revisions to the City's flood plain development regulations. Because the new FIRM(s) incorporate LiDAR data, they are more accurate than the existing flood plain maps that were adopted on August 18, 2011. The new maps narrow the floodplain areas which removes 49 structures that were previously identified to be in the 100-year regulatory floodplain. The new FIRM(s) identify five (5) structures that will be added to the regulatory floodplain. Of the 23 FIRM(s) that cover the city of Dubuque, 18 are required to be adopted by August 10, 2021. The remaining five (5) FIRMS were updated on August 19, 2013, as part of recertification of the Mississippi River floodwall/levee. These maps are not being updated at this time. After adoption of the new FIRM(s), the city will have 192 structures located in regulatory floodplains which is down from 236 structures. Attached to this memorandum is a draft ordinance of the Title 16-6-4 Flood Hazard Overlay District. The ordinance repeals Title 16-6-4 and adopts the updated model ordinance provided by the IDNR. In addition, attached is a document that notes the major changes to the existing floodplain regulations. The new provisions include referencing the new map panels and regulations related to non -conformities, severability, penalties, amendments, and new definitions. In addition, language was modified for the Floodway, Floodway Fringe and General Floodplain overlay districts. RECOMMENDATION Planning staff recommends the Zoning Advisory Commission review the enclosed changes to the City's flood hazard overlay district and recommend approval to the City Council. Attachments 2 Current Effective FEMA Flood Map INSET MAP 1 J" W. 32nd Street I �0 3 1 z Current Effective FEMA Flood Map Legend Structure Added to the Floodplain FEMA 100 Year Regulatory Floodplain INSET MAP 2 Middle Road O' K O O 2 O O O 2 Revised FEMA Flood Map - W. 32nd Street 7 d a a3i m; r A� d�, Revised FEMA Flood Map Current Effective FEMA Flood Map IN! � i t �� r� 1 E S eet r Ta` Hagen Street ,�. .r 'k Current Effective FEMA Flood Map II` IET MAP 3 ISET MAP 4 Current Effective FEMA Flood Map INSET MAP S end IStructure Removed from the Floodplain FEMA 100 Year Regulatory Floodplain Revised FEMA Flood Map elL T„� , Hagen Street a Revised FEMA Flood Map Revised FEMA Flood Map Kensington PlAce f I � ,7 , i� Current Effective FEMA Flood Map *aidiL•i.• Y L Jc� F US ZD/Do 5 Current Effective FEMA Flood Map Legend . Structure Removed from the Floodplain FEMA 100 Year Regulatory Floodplain INSET MAP 6 INSET MAP 7 Revised FEMA Flood Map r` U T- IF Y. f P USzp •} � Dodge Street F Revised FEMA Flood Map Current Effective FEMA Flood Map A Current Effective FEMA Flood Map Od _ O• d Drive Q0 CreekHooda°Sow r ;r Current Effective FEMA Flood Map Legend U6Structure Removed from the Floodplain FEMA 100 Year Regulatory Floodplain teC G<o�e�C\Je m H o _ i U f a U a' INSET MAP 8 INSET MAP 9 Revised FEMA Flood Map Revised FEMA Flood Map INSET MAP 10 Revised FEMA Flood Map Current Effective FEMA Flood Map INSET MAP 11 Current Effective FEMA Flood Map INSET MAP 12 w Jerue � Current Effective FEMA Flood Map Legend Structure Removed from the Floodplain FEMA 100 Year Regulatory Floodplain Revised FEMA Flood Map Revised FEMA Flood Map 7 A �e P INSET MAP 13 Revised FEMA Flood Map Current Effective FEMA Flood Map INSET MAP 14 Revised FEMA Flood Map Legend Structure Removed from the Floodplain FEMA 100 Year Regulatory Floodplain What is National Flood Insurance Program (NFIP)? The National Flood Insurance Program (NFIP), managed by the Federal Emergency Management Agency (FEMA), enables homeowners, business owners and renters in participating communities to purchase federally backed flood insurance. This insurance offers an insurance alternative to disaster assistance to meet the escalating costs of repairing flood damage to buildings and their contents. Participating communities (6501owa communities participate) agree to adopt and enforce floodplain management ordinances to reduce future flood damage. There are now more than 20,600 participating communities across the United States and its territories. Federal flood insurance is available for residents and business owners in both high -risk and moderate -to -low risk areas. The insurance is required for buildings in high -risk areas that have loans from federally regulated or insured lenders. This requirement extends to disaster assistance loans from the Small Business Administration. However, you don't need to have a mortgage or SBA loan or live in a high -risk area to obtain flood insurance. It is available community -wide, with premiums that vary according to the level of risk. In fact, about 25 percent of all flood claims occur in moderate- to low- risk areas, and premiums start as low as $119 per year. Your community maintains a repository of Flood Insurance Rate Maps (FIRMS) that you can view to determine whether your property is located in a high -risk or a moderate- to low -risk area. These maps are usually available at the planning and zoning department where building permits are obtained. They also may be found online at http//msc.fema.gov. If you still have questions after obtaining your flood hazard zone, you may call a FEMA mapping specialist toll free at 1-877-336-2627. Anyone living in a participating community should consider flood insurance before the next flood occurs. Flood insurance, like other property and casualty coverage, is written by licensed insurance agents. The agent who writes your homeowners or property insurance should be able to assist you in determining your eligibility and coverage options. Who is eligible for National Flood Insurance Program (NFIP)? Some forms of disaster assistance will require that flood insurance is obtained and maintained for different lengths of time. Refer to those programs to learn their specific requirements. Federal flood insurance, however, is not a disaster assistance program. It is an insurance program established to help property owners to recover more quickly and at less cost. For example, disaster loans have to be repaid along with any other outstanding mortgages; flood insurance payments do not have to be repaid. Flood insurance is available to property owners and renters, even if they have had a claim before, as long as they live in a participating community. National Flood Insurance Program Fact Sheet The National Flood Insurance Program (NFIP) was established with the passage of the National Flood Insurance Act of 1968. The NFIP is a federal pro- gram enabling property owners in participating communities to purchase flood insurance as pro- tection against flood losses, while requiring state and local governments to enforce floodplain man- agement ordinances that aim to reduce future flood damage. More than 22,100 communities in the U.S. participating in the NFIP and more than 5.1 million NFIP policies in force, providing $1.25 tril- lion of content and building coverage. Financial Protection Against Flood Loss Floods are the most common and costly natural disaster in the United States. Fortunately, property owners who live in communities participating in the NFIP can pur- chase affordable protection to insure against flood losses. Since 1978, the NFIP has paid nearly $52.5 bil- lion dollars in flood insurance claims that have helped hundreds of thousands of families and businesses re- cover from flood events. To participate in the NFIP, a community must adopt and enforce floodplain management ordinances that meet or exceed the minimum requirements of the Pro- gram. These requirements are intended to prevent loss of life, loss of property, reduce taxpayer costs for dis- aster relief, as well as minimize economic and social hardships that result from flooding. The specific re- quirements that a community must adopt depend on the type of flood hazard faced by the community. The NFIP has an arrangement with private insurance companies to sell and service flood insurance policies. See a list of those companies at: http://www.fema.gov/ wyo_company. Andrea Booher/FEMA Photo Myths and Misconceptions A common misconception is that homeowners' policies cover flood damage. In fact, most homeowner. In fact, most homeowner and business multi —peril policies do not cover flooding. In addition, federal disaster assis- tance will not always pay for flood damage. The Presi- dent must declare a major disaster before most forms of federal disaster assistance can be offered and most forms of disaster assistance are loans that must be re- paid with interest. In 2016, the average flood policy costs about $700 a year and the average total paid claim has been more than $31,000. Everyone Needs Flood Insurance While flood insurance is not mandatory for home- owners outside of a high -risk area, anyone can be fi- nancially vulnerable to floods. People outside of high - risk areas file more than 20 percent of NFIP claims and receive one-third of disaster assistance for flood- ing. Residential and commercial property owners who are not located in high -risk areas should ask their agents if they are eligible for the Preferred Risk Poli- cy, which provides affordable flood insurance protec- tion, starting as low as $137 a year in 2016. "FEMA's mission is to support our citizens and first responders to ensure that as a nation we work together to build, sustain, and Improve our ca- pability to prepare for, protect against, respond to, recover from, and mitigate all hazards." Page 1 of 2 Flood Insurance Requirements Residents and business owners who own property in high -risk areas (sometimes referred to as Special Flood Haz- ard Areas [SFHAs]) are required to purchase flood insurance if they have a mortgage from a federally regulated or insured lender. They also must carry the insurance for the life of the mortgage. Residents and business owners with a mortgage on a building outside high -risk areas can also purchase flood insurance and may be eligible for lower -cost Preferred Risk Policies. Waiting Period In general, a policy does not take effect until 30 days after the purchase of flood insurance. However, if a policy is pur- chased in connection with making, increasing, extending, or renewing a loan there is no waiting period and only a one day waiting period if purchase is related to the revision or update of a Flood Insurance Rate Map (FIRM) within 13 months of the new FIRM's effective date. What Is Not Covered by Flood Insurance Physical damage to a building or personal possessions that are directly caused by a flood are generally covered by flood insurance. For example, damage caused by a sewer backup is covered if the backup is a direct result of flooding. However, if the backup is caused by some other problem, the damage is not covered. The Flood Insurance Program is Evolving The NFIP is focusing making America truly "Flood Smart." The NFIP is a comprehensive program that encourages property owners to seriously consider their risks and ways they can lessen those risks —and flood insurance is obviously a key component. Purchasing flood insurance is still the most powerful action survivors can take to mitigate the financial risk of flood before and recover after a flood event. Flood insurance is both a mitigation and recovery tool. This means customers need to understand how flood insurance works, the value of the product, and be able to navigate processes —like the claims process. In addition to building trust with policyholders, improving communication and making processes simpler to un- derstand and navigate, the NFIP is also focusing on its commitment to strengthening partnerships and engage- ments with communities. Historically, with things like Climate Change occurring, and population movements into flood -prone areas, floodplain management has never been more important. Communities must make excellent decisions that will help them reduce damage from future flood events and the NFIP is supporting them in new, innovative ways. For Additional Information For additional information about the NFIP or the F1oodSmart campaign, visit: F1oodSmart.gov or FEMA. gov. "FEMA's mission is to support our citizens and first responders to ensure that as a nation we work together to build, sustain, and Improve our ca- pability to prepare for, protect against, respond to, recover from, and mitigate all hazards." Page 2 of 2 STATE OF IOWA SS: DUBUQUE COUNTY CERTIFICATE OF PUBLICATION I, Kathy Goetzinger, a Billing Clerk for Woodward Communications, Inc., an Iowa corporation, publisher of the Telegraph Herald, a newspaper of general circulation published in the City of Dubuque, County of Dubuque and State of Iowa; hereby certify that the attached notice was published in said newspaper on the following dates: 06/11/2021 and for which the charge is 33.16 Subscribed to before me; a Notary Public and for Dubuque County, Iowa, this I Ith day of June, 2021 Not ublic in and for Dubuque County, Iowa. JANEM PAPE _? IC Number 199869 My Comm. Exp. DEC it, 2022 Ad text : CITY OF DUBUQUE, IOWA OFFICIAL NOTICE PUBLIC NOTICE is hereby given that the Dubuque City Council will conduct a public hearing on the 21st day of June, 2021, at 6:30 p.m., conducted virtually on the following: Amend Planned Unit Development (PUD) Request from Straka Johnson Architects, P.C. to amend the Planned Residential (PR) zoning district located at 3485 Windsor Ave to facilitate the construction of an Administration and Outreach addition. Text Amendment Request from City of Dubuque to amend Section 16-6-4 Flood Hazard Overlay District of the Unified Development Code. Due to the ongoing COVID-19 pandemic, the City Council will meet virtually through GoToMeeting. The official agenda will be posted the Friday before the meeting and will contain listening, viewing, and public input options. The City Council agenda can be accessed at https://cityofdubuque.novusagenda.conVAgendaPublic/ or by contacting the City Clerk's Office at 563-589-4100, ctyclerk@cityofdubuque.org. Copies of supporting documents for the public hearings are on file in the City Clerk's Office, City Hall, 50 W. 13th St., Dubuque, Iowa, and may be viewed during normal working hours. To comply with social distancing mandates, documents can be viewed at https://www.cityofdubuque.org/Agendas or by contacting the City Clerk's Office at 563-589-4100. Written comments regarding the above public hearings may be submitted to the City Clerk's Office, 50 W. 13th St., Dubuque, IA 52001, on or before said time of public hearing. At said time and place of public hearings all interested citizens and parties will be given an opportunity to be heard for or against said proposal. Individuals with limited English proficiency, vision, hearing or speech impairments requiring special assistance should contact the City Clerk's Office at (563) 589-4100, TDD (563) 690-6678, ctyclerk@cityofdubuque.org as soon as feasible. Deaf or hard -of -hearing individuals can use Relay Iowa by dialing 711 or (800) 735-2942. Adrienne N. Breitfelder City Clerk It 6/11 STATE OF IOWA SS: DUBUQUE COUNTY CERTIFICATE OF PUBLICATION I, Kathy Goetzinger, a Billing Clerk for Woodward Communications, Inc., an Iowa corporation, publisher of the Telegraph Herald, a newspaper of general circulation published in the City of Dubuque, County of Dubuque and State of Iowa; hereby certify that the attached notice was published in said newspaper on the following dates: 07/16/2021 and for which the charge is 631.82 Subscribed to before me, a Not lie in and for Dubuque County, Iowa, this 26th day of July, 2021 Notary lic in and for Dubuque ounty, Iowa. a =11K�Eo199559My 11, 2022 Ad text : OFFICIAL PUBLICATION ORDINANCE NO. 24-21 AN ORDINANCE AMENDING TITLE 16 OF THE CITY OF DUBUQUE CODE OF ORDINANCES, UNIFIED DEVELOPMENT CODE, BY REPEALING SECTION 64 FLOOD HAZARD OVERLAY DISTRICT AND ENACTING A NEW SECTION 6-4 FLOOD HAZARD OVERLAY DISTRICT TO COMPLY WITH NATIONAL FLOOD INSURANCE PROGRAM REQUIREMENTS. NOW, THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF DUBUQUE, IOWA: Section 1. That Title 16 of the City of Dubuque Code of Ordinances, Unified Development Code, be amended by repealing Section 6-4 and enacting a new Section 6-4 Flood Hazard Overlay Districts, as follows: 16-6-4: FLOOD HAZARD OVERLAY DISTRICT 16-6-4-1: DEFINITIONS: Unless specifically defined below or in Chapter 2 of this title, words or phrases used in Section 16-6-4 shall be interpreted so as to give them the meaning they have in common usage and to give Section 16-6-4 its most reasonable application. 1. "APPURTENANT STRUCTURE - A structure which is on the same parcel of the property as the principal structure to be insured and the use of which is incidental to the use of the principal structure. 2. "BASE FLOOD - The flood having one (1) percent chance of being equaled or exceeded in any given year. (Also commonly referred to as the 100-year flood). 3. "BASE FLOOD ELEVATION (BFE) - The elevation floodwaters would reach at a particular site during the occurrence of a base flood event. 4."BASEMENT - Any enclosed area of a building which has its floor or lowest level below ground level (subgrade) on all sides. Also see 'lowest floor." 5."DEVELOPMENT - Any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation, drilling operations or storage of equipment or materials. Development does not include "minor projects" or "routine maintenance of existing buildings and facilities" as defined in this section. It also does not include gardening, plowing, and similar practices that do not involve filling or grading. 6."ENCLOSED AREA BELOW LOWEST FLOOR - The floor of the lowest enclosed area in a building when all the following criteria are met: A. "The enclosed area is designed to flood to equalize hydrostatic pressure during flood events with walls or openings that satisfy the provisions of Section 16-6-4-7(2)(D)(1) of Title 16, and B. "The enclosed area is unfinished (not carpeted, drywalled, etc.) and used solely for low damage potential uses such as building access, parking or storage, and C. "Machinery and service facilities (e.g., hot water heater, furnace, electrical service) contained in the enclosed area are located at least one (1) foot above the base flood elevation, and D. "The enclosed area is not a "basement' as defined in this section. 7. "EXISTING CONSTRUCTION - Any structure for which the "start of construction" commenced before the effective date of the first floodplain management regulations adopted by the community. 8. "EXISTING FACTORY -BUILT HOME PARK OR SUBDIVISION - A factory -built home park or sub -division for which the construction of facilities for servicing the lots on which the factory -built homes are to be affixed (including at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed before the effective date of the first floodplain management regulations adopted by the community. 9. "EXPANSION OF EXISTING FACTORY -BUILT HOME PARK OR SUBDIVISION - The preparation of additional sites by the construction of facilities for servicing the lots on which the factory -built homes are to be affixed (including at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads). 10."FACTORY-BUILT HOME - Any structure, designed for residential use which is wholly or in substantial part, made, fabricated, formed or assembled in manufacturing facilities for installation or assembly and installation, on a building site. For the purpose of Section 16-6-4 factory -built homes include mobile homes, manufactured homes, and modular homes; and also include "recreational vehicles" which are placed on a site for greater than 180 consecutive days and not fully licensed for and ready for highway use. 11. "FACTORY -BUILT HOME PARK OR SUBDIVISION - A parcel or contiguous parcels of land divided into two or more factory -built home lots for sale or lease. 12."FIVE HUNDRED (500) YEAR FLOOD - A flood, the magnitude of which has a two -tenths (0.2) percent chance of being equaled or exceeded in any given year or which, on average, will be equaled or exceeded at least once every five hundred (500) years. 13. "FLOOD - A general and temporary condition of partial or complete inundation of normally dry land areas resulting from the overflow of streams or rivers or from the unusual and rapid runoff of surface waters from any source. 14. "FLOOD INSURANCE RATE MAP (FIRM) - The official map prepared as part of (but published separately from) the Flood Insurance Study which delineates both the flood hazard areas and the risk premium zones applicable to the community. 15."FLOOD INSURANCE STUDY (FIS) - A report published by FEMA for a community issued along with the communitys Flood Insurance Rate Map(s). The study contains such background data as the base flood discharge and water surface elevations that were used to prepare the FIRM. 16. "FLOODPLAIN - Any land area susceptible to being inundated by water as a result of a flood. 17." FLOODPLAIN MANAGE-MENT - An overall program of corrective and preventive measures for reducing flood damages and promoting the wise use of floodplains, including but not limited to emergency preparedness plans, flood control works, floodproofing and floodplain management regulations. 18. "FLOODPROOFING - Any combination of structural and nonstructural additions, changes, or adjustments to structures, including utility and sanitary facilities, which will reduce or eliminate flood damage to such structures. 19. "FLOODWAY - The channel of a river or stream and those portions of the floodplains adjoining the channel, which are reasonably required to carry and discharge flood waters or flood flows so that confinement of flood flows to the floodway area will not cumulatively increase the water surface elevation of the base flood by more than one (1) foot. 20. "FLOODWAY FRINGE - Those portions of the Special Flood Hazard Area outside the floodway. 21. "HIGHEST ADJACENT GRADE - The highest natural elevation of the ground surface prior to construction next to the proposed walls of a structure. 22. "HISTORIC STRUCTURE - Any structure that is: A. "Listed individually in the National Register of Historic Places, maintained by the Department of Interior, or preliminarily determined by the Secretary of the Interior as meeting the requirements for individual listing of the National Register; B. "Certified or preliminarily determined by the Secretary of the Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined by the Secretary to qualify as a registered historic district; C. "Individually listed on a state inventory of historic places in states with historic preservation programs which have been approved by the Secretary of the Interior; or, D. "Individually listed on a local inventory of historic places in communities with historic preservation programs that have been certified by either i) an approved state program as determined by the Secretary of the Interior or ii) directly by the Secretary of the Interior in states without approved programs. 23. "LOWEST FLOOR - The floor of the lowest enclosed area in a building including a basement except when the criteria listed in the definition of Enclosed Area below Lowest Floor are met. 24. "MAXIMUM DAMAGE POTENTIAL DEVELOPMENT - Hospitals and like institutions; buildings or building complexes containing documents, data, or instruments of great public value; buildings or building complexes containing materials dangerous to the public or fuel storage facilities; power installations needed in emergency or other buildings or building complexes similar in nature or use. 25. "MINOR PROJECTS - Small development activities (except for filling, grading and excavating) valued at less than $500. 26."NEW CONSTRUCTION - (new buildings, factory -built home parks) - Those structures or development for which the start of construction commenced on or after the effective date of the first floodplain management regulations adopted by the community. 27. "NEW FACTORY -BUILT HOME PARK OR SUBDIVISION - A factory -built home park or subdivision for which the construction of facilities for servicing the lots on which the factory -built homes are to be affixed (including at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed on or after the effective date of the first floodplain management regulations adopted by the community. 28."RECREATIONAL VEHICLE - A vehicle which is: A. "Built on a single chassis; B. "Four hundred (400) square feet or less when measured at the largest horizontal projection; C."Designed to be self-propelled or permanently towable by a light duty truck; and D."Designed primarily not for use as a permanent dwelling but as a temporary living quarters for recreational, camping, travel, or seasonal use. 29."ROUTINE MAINTENANCE OF EXISTING BUILDINGS AND FACILITIES - Repairs necessary to keep a structure in a safe and habitable condition that do not trigger a building permit, provided they are not associated with a general improvement of the structure or repair of a damaged structure. Such repairs include: A. "Normal maintenance of structures such as re -roofing, replacing roofing tiles and replacing siding; B."Exterior and interior painting, papering, tiling, carpeting, cabinets, counter tops and similar finish work; C. "Basement sealing; D."Repairing or replacing damaged or broken window panes; E. "Repairing plumbing systems, electrical systems, heating or air conditioning systems and repairing wells or septic systems. 30."SPECIAL FLOOD HAZARD AREA (SFHA) - The land within a community subject to the "base flood". This land is identified on the communitys Flood Insurance Rate Map as Zone A, Al-30, AE, AH, AO, AR, and/or A99. 31."START OF CONSTRUC-TION - Includes substantial improvement, and means the date the development permit was issued, provided the actual start of construction, repair, reconstruction, rehabilitation, addition, placement, or other improvement, was within 180 days of the permit date. The actual start means either the first placement or permanent construction of a structure on a site, such as pouring of a slab or footings, the installation of pile, the construction of columns, or any work beyond the stage of excavation; or the placement of a factory -built home on a foundation. Permanent construction does not include land preparation, such as clearing, grading and filling; nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footings, piers, or foundations or the erection of temporary forms; nor does it include the installation on the property of accessory buildings such as garages or sheds not occupied as dwelling units or not part of the main structure. For a substantial improvement, the actual start of construction means the first alteration of any wall, ceiling, floor, or other structural part of the building, whether or not that alteration affects the external dimensions of the building. 32. STRUCTURE - Anything con- structed or erected on the ground or attached to the ground, including, but not limited to, buildings, factories, sheds, cabins, factory -built homes, storage tanks, grain storage facilities and/or other similar uses. 33."SUBSTANTIAL DAMAGE - Damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damage condition would equal or exceed fifty (50) percent of the market value of the structure before the damage occurred. Volunteer labor and donated materials shall be included in the estimated cost of repair. 34."SUBSTANTIAL IMPROVE-MENT - Any improvement to a structure which satisfies either of the following criteria: A. "Any repair, reconstruction, or improvement of a structure, the cost of which equals or exceeds fifty (50) percent of the market value of the structure either (i) before the "start of construction" of the improvement, or (ii) if the structure has been "substantially damaged" and is being restored, before the damage occurred. The term does not, however, include any project for improvement of a structure to correct existing violations of state or local health, sanitary, or safety code specifications which have been identified by the local code enforcement official and which are the minimum necessary to assure safe living conditions. The term also does not include any alteration of an "historic structure", provided the alteration will not preclude the structures designation as an "historic structure". B. "Any addition which increases the original floor area of a building by 25 percent or more. All additions constructed after the effective date of the first floodplain management regulations adopted by the community shall be added to any proposed addition in determining whether the total increase in original floor space would exceed 25 percent. 35. WARIANCE - A grant of relief by a community from the terms of the floodplain management regulations. 36. WIOLATION - The failure of a structure or other development to be fully compliant with the communitys floodplain management regulations. 16-6-4-2: STATUTORY AUTHORITY, FINDINGS OF FACT AND PURPOSE: 1. "The Legislature of the State of Iowa has in Chapter 414, Code of Iowa, as amended, delegated the power to cities to enact zoning regulations to secure safety from flood and to promote health and the general welfare. 2. "Findings of Fact A. "The flood hazard areas of the City of Dubuque are subject to periodic inundation which can result in loss of life and property, health and safety hazards, disruption of commerce and governmental services, extraordinary public expenditures for flood protection and relief, and impairment of the tax base all of which adversely affect the public health, safety and general welfare of the community. B. "These flood losses, hazards, and related adverse effects are caused by: (i) The occupancy of flood hazard areas by uses vulnerable to flood damages which create hazardous conditions as a result of being inadequately elevated or otherwise protected from flooding and (ii) the cumulative effect of obstructions on the floodplain causing increases in flood heights and velocities. C."Section 16-6-4 relies upon engineering methodology for analyzing flood hazards which is consistent with the standards established by the Department of Natural Resources. 3. "Statement of Purpose It is the purpose of Section 16-6-4 to protect and preserve the rights, privileges and property of the City of Dubuque and its residents and to preserve and improve the peace, safety, health, welfare, and comfort and convenience of its residents by minimizing those flood losses described in Section 16-6-4-2(2)(A) of Title 16 Unified Development Code with provisions designed to: A. "Reserve sufficient floodplain area for the conveyance of flood flows so that flood heights and velocities will not be increased substantially. B. "Restrict or prohibit uses which are dangerous to health, safety or property in times of flood or which cause excessive increases in flood heights or velocities. C."Require that uses vulnerable to floods, including public facilities which serve such uses, be protected against flood damage at the time of initial construction or substantial improvement. D. "Protect individuals from buying lands which may not be suited for intended purposes because of flood hazard. E."Assure that eligibility is maintained for property owners in the community to purchase flood insurance through the National Flood Insurance Program. 16-64-3: GENERAL PROVISIONS: 1."Lands to Which Unified Development Code Section 16-6-4 Apply The provisions of Section 16-6-4 shall apply to all lands within the jurisdiction of the City of Dubuque shown on the Official Floodplain Zoning Map as being within the boundaries of the Floodway, Floodway Fringe, and General Floodplain (Overlay) Districts, as established in Section 16-6-4-5. 2. "Establishment of Official Floodplain Zoning Map The Flood Insurance Rate Map (FIRM) for Dubuque County and Incorporated Areas, City of Dubuque, Panels 19061CO215F, 0217F, 0220F, 0236F, 0237F, 0238F, 0239F, 0241F, 0330F, 0332F, 0335F, 0351F, 0352F, 0354F, 0358F, 0365F, 0370F, dated August loth, 2021, and Panels 19061CO242F, 0243F, 0244F, 0356F, 0360F, dated August 19th, 2013 which were prepared as part of the Flood Insurance Study for Dubuque County, is (are) hereby adopted by reference and declared to be the Official Floodplain Zoning Map. The flood profiles and all explanatory material contained with the Flood Insurance Study are also declared to be a part of Section 16-6-4. 3. "Rules for Interpretation of District Boundaries The boundaries of the zoning district areas shall be determined by scaling distances on the Official Floodplain Zoning Map. When an interpretation is needed as to the exact location of a boundary, the City Planner shall make the necessary interpretation. The Board of Adjustment shall hear and decide appeals when it is alleged that there is an error in any requirement, decision, or determination made by the City Planner in the enforcement or administration of Section 16-6-4. 4."Compliance No structure or land shall hereafter be used and no structure shall be located, extended, converted or structurally altered without full compliance with the terms of Section 16-6-4 and other applicable regulations which apply to uses within the jurisdiction of Section 16-6-4. 5. "Abrogation and Greater Restrictions It is not intended by Section 16-6-4 to repeal, abrogate or impair any existing easements, covenants, or deed restrictions. However, where Section 16-6-4 imposes greater restrictions, the provision of Section 16-6-4 shall prevail. All other ordinances inconsistent with Section 16-6-4 are hereby repealed to the extent of the inconsistency only. 6."Interpretation In their interpretation and application, the provisions of Section 16-6-4 shall be held to be minimum requirements and shall be liberally construed in favor of the governing body and shall not be deemed a limitation or repeal of any other powers granted by State statutes. 7. "Warning and Disclaimer of Liability The standards required by Section 16-6-4 are considered reasonable for regulatory purposes. Section 16-6-4 does not imply that areas outside the designated Floodplain (Overlay) District areas will be free from flooding or flood damages. Section 16-6-4 shall not create liability on the part of the City of Dubuque or any officer or employee thereof for any flood damages that result from reliance on Section 16-6-4 or any administrative decision lawfully made there under. 8."Severability If any section, clause, provision or portion of Section 16-6-4 is adjudged unconstitutional or invalid by a court of competent jurisdiction, the remainder of Section 16-6-4 shall not be affected thereby. 16-6-44: Administration: L "Appointment, Duties and Responsibilities of Local Official A. "The City Planner is hereby appointed to implement and administer the provisions of Section 16-6-4 and will herein be referred to as the Administrator. B. "Duties and responsibilities of the Administrator shall include, but not necessarily be limited to the following: 1)"Review all floodplain development permit applications to assure that the provisions of Section 16-6-4 will be satisfied. 2)"Review floodplain development applications to assure that all necessary permits have been obtained from federal, state and local governmental agencies including approval when required from the Department of Natural Resources for floodplain construction. 3)"Record and maintain a record of (i) the elevation (in relation to North American Vertical Datum 1988) of the lowest floor (including basement) of all new or substantially improved structures or (ii) the elevation to which new or substantially improved structures have been floodproofed. 4)"Notify adjacent communities/counties and the Department of Natural Resources prior to any proposed alteration or relocation of a watercourse and submit evidence of such notifications to the Federal Emergency Management Agency. 5)"Keep a record of all permits, appeals and such other transactions and correspondence pertaining to the administration of Section 16-6-4. 6)"Submit to the Federal Insurance Administrator an annual report concerning the communitys participation, utilizing the annual report form supplied by the Federal Insurance Administrator. 7)"Notify the Federal Insurance Administrator of any annexations or modifications to the community's boundaries. 8)"Review subdivision proposals to ensure such proposals are consistent with the purpose of Section 16-6-4 and advise the Board of Adjustment of potential conflict. 9)"Maintain the accuracy of the community's Flood Insurance Rate Maps when; a. "Development placed within the Floodway (Overlay) District results in any of the following: (i)"An increase in the Base Flood Elevations, or (ii)"Alteration to the floodway boundary b."Development placed in Zones A, AE, AH, and Al-30 that does not include a designated floodway, that will cause a rise of more than one foot in the base elevation; or c."Development relocates or alters the channel. Within 6 months of the completion of the development, the applicant shall submit to FEMA all scientific and technical data necessary for a Letter of Map Revision. 10)"Perform site inspections to ensure compliance with the standards of Section 16-6-4. 11)"Forward all requests for Variances to the Board of Adjustment for consideration. Ensure all requests include the information ordinarily submitted with applications as well as any additional information deemed necessary to the Board of Adjustment. 2. "Floodplain Development Permit A. "Permit Required - A Floodplain Development Permit issued by the Administrator shall be secured prior to any floodplain development (any man-made change to improved and unimproved real estate, including but not limited to buildings or other structures, mining, filling, grading, paving, storage of materials or equipment, excavation or drilling operations), including the placement of factory -built homes. B. "Application for Permit - Applica-tion shall be made on forms furnished by the Administrator and shall include the following: 1)"Description of the work to be covered by the permit for which application is to be made. 2)"Description of the land on which the proposed work is to be done (i.e., lot, block, track, street address or similar description) that will readily identify and locate the work to be done. 3)"Location and dimensions of all structures and additions 4)"Indication of the use or occupancy for which the proposed work is intended. 5)"Elevation of the base flood. 6)"Elevation (in relation to North American Vertical Datum 1988) of the lowest floor (including basement) of structures or of the level to which a structure is to be floodproofed. 7)"For structures being improved or rebuilt, the estimated cost of improvements and market value of the structure prior to the improvements. 8)"Such other information as the Administrator deems reasonably necessary (e.g., drawings or a site plan) for the purpose of Section 16-6-4. C. "Action on Permit Application - The Administrator shall, within a reasonable time, make a determination as to whether the proposed floodplain development meets the applicable standards of Section 16-6-4 and shall approve or disapprove the application. For disapprovals, the applicant shall be informed, in writing, of the specific reasons therefore. The Administrator shall not issue permits for variances except as directed by the Board of Adjustment. D."Construction and Use to be as Provided in Application and Plans - Floodplain Development Permits based on the basis of approved plans and applications authorize only the use, arrangement, and construction set forth in such approved plans and applications and no other use, arrangement or construction. Any use, arrangement, or construction at variance with that authorized shall be deemed a violation of Section 16-6-4. The applicant shall be required to submit certification by a professional engineer or land surveyor, as appropriate, registered in the State of Iowa, that the finished fill, structure floor elevations, floodproofing, or other flood protection measures were accomplished in compliance with the provisions of Section 16-6-4, prior to the use or occupancy of any structure. 16-6-4-5: ESTABLISHMENT OF FLOODPLAIN (OVERLAY) DISTRICTS: The floodplain areas within the jurisdiction of Section 16-6-4 are hereby divided into the following districts: 1. "Floodway (Overlay) District (FW) - those areas identified as Floodway on the Official Floodplain Zoning Map; 2. "Floodway Fringe (Overlay) District (FF) - those areas identified as Zone AE on the Official Floodplain Zoning Map but excluding those areas identified as Floodway; 3."General Floodplain (Overlay) District (GF) - those areas identified as Zone A on the Official Floodplain Zoning Map. The boundaries shall be as shown on the Official Floodplain Zoning Map. Within these districts, all uses not allowed as Permitted Uses are prohibited unless a variance to the terms of Section 16-6-4 is granted after due consideration by the Board of Adjustment. 16-6-4-6: FLOODWAY (OVERLAY) DISTRICT (FW): 1. "Permitted Uses All development within the Floodway District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet applicable performance standards of the Floodway District. 2. "Performance Standards All Floodway District uses allowed as a Permitted Use shall meet the following standards. A. "No development shall be permitted in the Floodway District that would result in any increase in the base flood elevation. Consideration of the effects of any development on flood levels shall be based upon the assumption that an equal degree of development would be allowed for similarly situated lands. B. "All development within the Floodway District shall: 1)"Be consistent with the need to minimize flood damage. 2)"Use construction methods and practices that will minimize flood damage. 3)"Use construction materials and utility equipment that are resistant to flood damage. C."No development shall affect the capacity or conveyance of the channel or floodway of any tributary to the main stream, drainage ditch or any other drainage facility or system. D."Structures, buildings, recreational vehicles, and sanitary and utility systems, if permitted, shall meet the applicable performance standards of the Floodway Fringe District and shall be constructed or aligned to present the minimum possible resistance to flood flows. E. "Structures, if permitted, shall have a low flood damage potential and shall not be for human habitation. F."Storage of materials or equipment that are buoyant, flammable, explosive or injurious to human, animal or plant life is prohibited. Storage of other material may be allowed if readily removable from the Floodway District within the time available after flood warning. G."Watercourse alterations or relocations (channel changes and modifications) must be designed to maintain the flood carrying capacity within the altered or relocated portion. In addition, such alterations or relocations must be approved by the Department of Natural Resources. H."Any fill allowed in the floodway must be shown to have some beneficial purpose and shall be limited to the minimum amount necessary. I. "Pipeline river or stream crossings shall be buried in the streambed and banks or otherwise sufficiently protected to prevent rupture due to channel degradation and meandering or due to the action of flood flows. 16-6-4-7: FLOODWAY FRINGE (OVERLAY) DISTRICT FF: 1. "Permitted Uses All development within the Floodway Fringe District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet applicable performance standards of the Floodway Fringe District. 2."Performance Standards All development must be consistent with the need to minimize flood damage and meet the following applicable performance standards. Until a regulatory floodway is designated, no development may increase the Base Flood Elevation more than one (1) foot. The applicant will be responsible for providing the Department of Natural Resources with sufficient technical information to make such determination. A. "All development shall: 1)"Be designed and adequately anchored to prevent flotation, collapse or lateral movement. 2) "Use construction methods and practices that will minimize flood damage. 3)"Use construction materials and utility equipment that are resistant to flood damage. B."Residential structures - All new or substantially improved residential structures shall have the lowest floor, including basement, elevated a minimum of one (1) foot above the base flood elevation. Construction shall be upon compacted fill which shall, at all points, be no lower than 1.0 ft. above the base flood elevation and extend at such elevation at least 18 feet beyond the limits of any structure erected thereon. Alternate methods of elevating (such as piers or extended foundations) may be allowed where existing topography, street grades, or other factors preclude elevating by fill. In such cases, the methods used must be adequate to support the structure as well as withstand the various forces and hazards associated with flooding. All new residential structures located in areas that would become isolated due to flooding of surrounding ground shall be provided with a means of access that will be passable by wheeled vehicles during the base flood. However, this criterion shall not apply where the Administrator determines there is sufficient flood warning time for the protection of life and property. When estimating flood warning time, consideration shall be given to the criteria listed in 567-75.2(3), Iowa Administrative Code. C."Non-residential structures - All new or substantially improved non-residential structures shall have the lowest floor (including basement) elevated a minimum of one (1) foot above the base flood elevation, or together with attendant utility and sanitary systems, be floodproofed to such a level. When floodproofing is utilized, a professional engineer registered in the State of Iowa shall certify that the floodproofing methods used are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the base flood; and that the structure, below the base flood elevation is watertight with walls substantially impermeable to the passage of water. A record of the certification indicating the specific elevation (in relation to North American Vertical Datum 1988) to which any structures are floodproofed shall be maintained by the Administrator. D. "AII new and substantially improved structures 1)"Fully enclosed areas below the "lowest floor" (not including basements) that are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or meet or exceed the following minimum criteria: a. "A minimum of two (2) openings, with positioning on at least two (2) walls, having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. b. "The bottom of all openings shall be no higher than one foot above grade. c."Openings may be equipped with screens, louvers, valves, or other coverings or devices provided they permit the automatic entry and exit of floodwaters. Such areas shall be used solely for parking of vehicles, building access and low damage potential storage. 2)"New and substantially improved structures must be designed (or modified) and adequately anchored to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy. 3)"New and substantially improved structures shall be constructed with electrical, heating, ventilation, plumbing, air conditioning equipment and other service facilities (including ductwork) elevated to a minimum of one (1) foot above the base flood elevation. E."Factory-built homes 1) "All new and substantially improved factory -built homes, including those placed in existing factory -built home parks or subdivisions, shall be elevated on a permanent foundation such that the lowest floor of the structure is a minimum of one (1) foot above the base flood elevation. 2) "All new and substantially improved factory -built homes, including those placed in existing factory -built home parks or subdivisions, shall be anchored to resist flotation, collapse, or lateral movement. Anchorage systems may include, but are not limited to, use of over -the -top or frame ties to ground anchors as required by the State Building Code. F."Utility and Sanitary Systems 1)"On-site wastewater disposal and water supply systems shall be located or designed to avoid impairment to the system or contamination from the system during flooding. 2)"All new and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the system as well as the discharge of effluent into flood waters. Wastewater treatment facilities (other than on -site systems) shall be provided with a level of flood protection equal to or greater than one (1) foot above the base flood elevation. 3)"New or replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system. Water supply treatment facilities (other than on -site systems) shall be provided with a level of protection equal to or greater than one (1) foot above the base flood elevation. 4)"Utilities such as gas or electrical systems shall be located and constructed to minimize or eliminate flood damage to the system and the risk associated with such flood damaged or impaired systems. G. "Storage of materials and equipment that are flammable, explosive or injurious to human, animal or plant life is prohibited unless elevated a minimum of one (1) foot above the base flood elevation. Other material and equipment must either be similarly elevated or (i) not be subject to major flood damage and be anchored to prevent movement due to flood waters or (ii) be readily removable from the area within the time available after flood warning. H. "Flood control structural works such as levees, flood walls, etc. shall provide, at a minimum, protection from the base flood with a minimum of 3 ft. of design freeboard and shall provide for adequate interior drainage. In addition, the Department of Natural Resources shall approve structural flood control works. I. "Watercourse alterations or relocations must be designed to maintain the flood carrying capacity within the altered or relocated portion. In addition, the Department of Natural Resources must approve such alterations or relocations. J."Subdivisions (including factory -built home parks and subdivisions) shall be consistent with the need to minimize flood damages and shall have adequate drainage provided to reduce exposure to flood damage. Development associated with subdivision proposals (including the installation of public utilities) shall meet the applicable performance standards of Section 16-6-4. Subdivision proposals intended for residential use shall provide all lots with a means of access which will be passable by wheeled vehicles during the base flood. Proposals for subdivisions greater than five (5) acres or fifty (50) lots (whichever is less) shall include base flood elevation data for those areas located within the Floodway Fringe (Overlay) District. K. "Accessory Structures to Residential Uses 1)"Detached garages, sheds, and similar structures that are incidental to a residential use are exempt from the base flood elevation requirements where the following criteria are satisfied: a. "The structure shall be designed to have low flood damage potential. Its size shall not exceed 600 sq. ft. in size. Those portions of the structure located less than I foot above the base flood elevation must be constructed of flood -resistant materials. b. "The structure shall be used solely for low flood damage potential purposes such as vehicle parking and limited storage. The structure shall not be used for human habitation. c. "The structure shall be constructed and placed on the building site so as to offer minimum resistance to the flow of floodwaters. d. "The structure shall be firmly anchored to prevent flotation, collapse, and lateral movement which may result in damage to other structures. e. "The structures service facilities such as electrical and heating equipment shall be elevated or floodproofed to at least one foot above the base flood elevation. f."The structure's walls shall include openings that satisfy the provisions of Section 16-64-7(2)(D)(1) of Title 16 Unified Development Code. 2)"Exemption from the base flood elevation requirements for such a structure may result in increased premium rates for flood insurance coverage of the structure and its contents. L."Recreational Vehicles 1)"Recreational vehicles are exempt from the requirements of Section 16-6-4-7(2)(E) of Title 16 Unified Development Code regarding anchoring and elevation of factory -built homes when the following criteria are satisfied: a. "The recreational vehicle shall be located on the site for less than 180 consecutive days, and, b. "The recreational vehicle must be fully licensed and ready for highway use. A recreational vehicle is ready for highway use if it is on its wheels or jacking system and is attached to the site only by quick disconnect type utilities and security devices and has no permanently attached additions. 2)"Recreational vehicles that are located on the site for more than 180 consecutive days or are not ready for highway use must satisfy requirements of Section 16-6-4-7(2)(E) of Title 16 Unified Development Code regarding anchoring and elevation of factory -built homes. M."Pipeline river and stream crossings shall be buried in the streambed and banks, or otherwise sufficiently protected to prevent rupture due to channel degradation and meandering. N."Maximum Damage Potential Development - All new or substantially improved maximum damage potential development shall have the lowest floor (including basement) elevated a minimum of one (1) foot above the elevation of the 500-year flood, or together with attendant utility and sanitary systems, be floodproofed to such a level. When floodproofing is utilized, a professional engineer registered in the State of Iowa shall certify that the floodproofing methods used are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces and other factors associated with the 0.2 % annual chance flood; and that the structure, below the 0.2% annual chance flood elevation is watertight with walls substantially impermeable to the passage of water. A record of the certification indicating the specific elevation (in relation to North American Vertical Datum 1988) to which any structures are floodproofed shall be maintained by the Administrator. Where 0.2% chance flood elevation data has not been provided in the Flood Insurance Study, the Iowa Department of Natural Resources shall be contacted to compute such data. The applicant will be responsible for providing the Department of Natural Resources with sufficient technical information to make such determinations. 16-6-4-8: GENERAL FLOODPLAIN (OVERLAY) DISTRICT (GF): 1."Permitted Uses A. "All development within the General Floodplain District shall be permitted to the extent that they are not prohibited by any other ordinance (or underlying zoning district) and provided they meet the applicable performance standards of the General Floodplain District. B. "Any development which involves placement of structures, factory -built homes, fill or other obstructions, storage of materials or equipment, excavation or alteration of a watercourse shall be reviewed by the Department of Natural Resources to determine (i) whether the land involved is either wholly or partly within the floodway or floodway fringe and (ii) the base flood elevation. The applicant shall be responsible for providing the Department of Natural Resources with sufficient technical information to make the determination. C. "Review by the Iowa Department of Natural Resources is not required for the proposed construction of new or replacement bridges or culverts where: 1)"The bridge or culvert is located on a stream that drains less than two (2) square miles, and 2)"The bridge or culvert is not associated with a channel modification that constitutes a channel change as specified in 567-71.2(2), Iowa Administrative Code. 2."Performance Standards A. "All development, or portions thereof, to be located in the floodway as determined by the Department of Natural Resources shall meet the applicable provisions and standards of the Floodway (Overlay) District Section 16-6-4-6. B."All development, or portions thereof, to be located in the floodway fringe as determined by the Department of Natural Resources shall meet the applicable provisions and standards of the Floodway Fringe (Overlay) District Section 16-6-4-7. 16-6-4-9: APPOINTMENT AND DUTIES OF BOARD OF ADJUSTMENT: 1."Appointment and Duties of Board of Adjustment - A Board of Adjustment is hereby established which shall hear and decide (i) appeals and (ii) requests for variances to the provisions of Section 16-6-4, and shall take any other action which is required of the Board. 2. "Appeals - Where it is alleged there is any error in any order, requirement, decision, or deter-mination made by an administrative official in the enforcement of Section 16-6-4, the aggrieved party may appeal such action. The notice of appeal shall be filed with the Board of Adjustment and with the official from whom the appeal is taken and shall set forth the specific reason for the appeal. The official from whom the appeal is taken shall transmit to the Board of Adjustment all the documents constituting the record upon which the action appealed from was taken. 3. "Variance - The Board of Adjust-ment may authorize upon request in specific cases such variances from the terms of Section 16-6-4 that will not be contrary to the public interest where, owing to special conditions, a literal enforcement of the provisions of Section 16-6-4 will result in unnecessary hardship. Variances granted must meet the following applicable standards: A. "Variances shall only be granted upon: (i) a showing of good and sufficient cause, (ii) a determination that failure to grant the variance would result in exceptional hardship to the applicant, and (iii) a determination that the granting of the variance will not result in increased flood heights, additional threats to public safety, extraordinary public expense, create nuisances, cause fraud on or victimization of the public or conflict with existing local codes or ordinances. B. "Variances shall not be issued within any designated floodway if any increase in flood levels during the base flood would result. Consideration of the effects of any development on flood levels shall be based upon the assumption that an equal degree of development would be allowed for similarly situated lands. C. "Variances shall only be granted upon a determination that the variance is the minimum necessary, considering the flood hazard, to afford relief. D. "In cases where the variance involves a lower level of flood protection for structures than what is ordinarily required by Section 16-6-4, the applicant shall he notified in writing over the signature of the Administrator that: (i) the issuance of a variance will result in increased premium rates for flood insurance up to amounts as high as $25 for $100 of insurance coverage and (ii) such construction increases risks to life and property. E."All variances granted shall have the concurrence or approval of the Department of Natural Resources. 4. "Hearings and Decisions of the Board of Adjustment A. "Hearings. Upon the filing with the Board of Adjustment of an Appeal or a request for a Variance, the Board shall hold a public hearing. The Board shall fix a reasonable time for the hearing and give public notice thereof, as well as due notice to parties in interest. At the hearing, any party may appear in person or by agent or attorney and present written or oral evidence. The Board may require the appellant or applicant to provide such information as is reasonably deemed necessary and may request the technical assistance and/or evaluation of a professional engineer or other expert person or agency, including the Department of Natural Resources. B."Decisions. The Board shall arrive at a decision on an Appeal or Variance within a reasonable time. In passing upon an Appeal, the Board may, so long as such action is in conformity with the provisions of Section 16-6-4, reverse or affirm, wholly or in part, or modify the order, requirement, decision, or determin-ation appealed from, and it shall make its decision, in writing, setting forth the findings of fact and the reasons for its decision. In granting a Variance, the Board shall consider such factors as contained in this section and all other relevant sections of Section 16-6-4 and may prescribe such conditions as contained in Section 16-6-4-9(B)(2). 1)7actors Upon Which the Decision of the Board of Adjustment Shall be Based. In passing upon applications for Variances, the Board shall consider all relevant factors specified in other sections of Section 16-6-4 and: a. "The danger to life and property due to increased flood heights or velocities caused by encroachments. b."The danger that materials may be swept on to other land or downstream to the injury of others. c. "The proposed water supply and sanitation systems and the ability of these systems to prevent disease, contamination and unsanitary conditions. d. "The susceptibility of the proposed facility and its contents to flood damage and the effect of such damage on the individual owner. e."The importance of the services provided by the proposed facility to the City. f. "The requirements of the facility for a floodplain location. g. "The availability of alternative locations not subject to flooding for the proposed use. h. "The compatibility of the proposed use with existing development and development anticipated in the foreseeable future. i."The relationship of the proposed use to the comprehensive plan and floodplain management program for the area. j."The safety of access to the property in times of flood for ordinary and emergency vehicles. k. "The expected heights, velocity, duration, rate of rise and sediment transport of the flood water expected at the site. 1."The cost of providing governmental services during and after flood conditions, including maintenance and repair of public utilities (sewer, gas, electrical and water systems), facilities, streets and bridges. m."Such other factors which are relevant to the purpose of Section 16-6-4. 2)"Conditions Attached to Variances - Upon consideration of the factors listed above, the Board of Adjustment may attach such conditions to the granting of variances as it deems necessary to further the purpose of Section 16-6-4. Such conditions may include, but not necessarily be limited to: a. "Modification of waste disposal and water supply facilities. b. "Limitation of periods of use and operation. c."Imposition of operational controls, sureties, and deed restrictions. d. "Requirements for construction of channel modifications, dikes, levees, and other protective measures, provided such are approved by the Department of Natural Resources and are deemed the only practical alternative to achieving the purpose of Section 16-6-4. e."Floodproofing measures shall be designed consistent with the flood protection elevation for the particular area, flood velocities, duration, rate of rise, hydrostatic and hydrodynamic forces, and other factors associated with the regulatory flood. The Board of Adjustment shall require that the applicant submit a plan or document certified by a registered professional engineer that the floodproofing measures are consistent with the regulatory flood protection elevation and associated flood factors for the particular area. 5."Appeals to the Court - Any person or persons, jointly or severally, aggrieved by any decision of the Board of Adjustment may present to a court of record a petition, duly verified, setting forth that such decision is illegal, in whole or in part, specifying the grounds of the illegality. Such petition shall be presented to the court within thirty days after the filing of the decision in the office of the Board. 16-64-10: NONCONFORMING USES: I. 'A structure or the use of a structure or premises which was lawful before the passage or amendment of Section 16-6-4, but which is not in conformity with the provisions of Section 16-6-4, may be continued subject to the following conditions: A. "If such use is discontinued for six (6) consecutive months, any future use of the building premises shall conform to Section 16-6-4. B."Uses or adjuncts thereof that are or become nuisances shall not be entitled to continue as nonconforming uses. C. "If any nonconforming use or structure is destroyed by any means, including flood, it shall not be reconstructed if the cost is more than fifty (50) percent of the market value of the structure before the damage occurred, unless it is reconstructed in conformity with the provisions of Section 16-6-4. This limitation does not include the cost of any alteration to comply with existing state or local health, sanitary, building or safety codes or regulations or the cost of any alteration of a structure listed on the National Register of Historic Places, provided that the alteration shall not preclude its continued designation. 2."Except as provided in Section 16-6-4-10(1)(B), any use which has been permitted as a Variance shall be considered a conforming use. 16-6-4-11: PENALTIES FOR VIOLATION: Violations of the provisions of Unified Development Code Section 16-6-4 or failure to comply with any of the requirements (including violations of conditions and safeguards established in connection with grants of Variances) shall constitute a misdemeanor. Any person who violates Section 16-6-4 or fails to comply with any of its requirements shall upon conviction thereof be fined not more than $500.00 (FIVE HUNDRED DOLLARS) or imprisoned for not more than 30 (THIRTY) days. Each day such violation continues shall be considered a separate offense. Nothing herein contained prevent the City of Dubuque from taking such other lawful action as is necessary to prevent or remedy violation. 16-64-12: AMENDMENTS: The regulations and standards set forth in Unified Development Code Section 16-6-4 may from time to time be amended, supplemented, changed, or repealed. No amendment, supplement, change, or modification shall be undertaken without prior approval of the Department of Natural Resources. Section 2. The ordinance shall take effect on August 10, 2021. Passed, approved and adopted this 21st day of June, 2021. /s/Danny C. Sprank, Mayor Pro Tem Attest: /s/Adrienne N. Breitfelder, City Clerk Published officially in the Telegraph Herald newspaper on the 16h day of July, 2021. /s/Adrienne N. Breitfelder, City Clerk It 7/16