Levee Certification_Interior Drainage Study Agreement Amendment_CDMMasterpiece on the Mississippi
Dubuque
Intd
AII- America City
' '
2007
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Levee Certification, Interior Drainage Study Agreement Amendment for
Design & Engineering Services, CDM
DATE: February 1, 2011
On August 18, 2010, the City Council provided authorization to negotiate a professional
services agreement with CDM for design and engineering services to perform
engineering analyses , prepare the necessary documentation, and submit an application
for a Letter of Map Revision (LOMR) to revise flood hazard zones identified in the Digital
Federal Insurance Rate Map (DFIRM) proposed by FEMA for the City of Dubuque.
City Engineer Gus Psihoyos recommends City Council approval to amend the City's
agreement with CDM to include the interior drainage study required as a prerequisite for
levee certification. This levee certification must be submitted to FEMA before May 17,
2011. CDM has agreed to analyze the eight additional drainage areas for a fee not to
exceed $69,300.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
MCVM:jh
Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Gus Psihoyos, City Engineer
Mic ael C. Van Milligen
BACKGROUND
Masterpiece on the Mississippi
Michael C. Van Milligen, City Mana6
DATE: January 17, 2011
INTRODUCTION
TO:
FROM: Gus Psihoyos, City Engineer
SUBJECT: Levee Certification, Interior Drainage Study
Agreement Amendment for Design & Engineering Services, CDM
Dubuque
All-America clly
2007
The purpose of this memo is to seek authorization to amend the City's contract with CDM to
include the interior drainage study required for levee certification.
On August 18, 2010, the City Council approved authorization to negotiate a professional services
agreement with CDM for design and engineering services to perform engineering analyses,
prepare the necessary documentation, and submit an application for a Letter of Map Revision
(LOMR) to revise flood hazard zones identified in the Digital Federal Insurance Rate Map (DFIRM)
proposed by FEMA for the City of Dubuque. On October 27, 2010, the City Manager executed an
agreement with CDM for services not to exceed $48,918.00.
In order for the flood insurance rate maps published by the Federal Emergency Management
Agency (FEMA) to continue to recognize that Dubuque's floodwall /levee system protects Dubuque
properties from the Mississippi River, a registered professional engineer must "certify" that the
levee system provides flood protection for the 100 -year flood as stipulated by FEMA regulations.
This levee "certification" must be submitted to FEMA before May 17, 2011. A member of the City's
Engineering Department will ultimately provide the necessary certification.
The United States Corp of Engineers (USACE) performed an engineering analysis of Dubuque's
levee system and reported their findings in the June 2010 Engineering Technical Review Report.
Overall, the USACE concluded that Dubuque's levee system meets or exceeds most engineering
standards. However, they indicated that an additional interior drainage analysis is required in order
to conclude that Dubuque's levee and floodwall system meets the requirements set forth by FEMA.
DISCUSSION
While CDM analyzed the drainage associated with the Bee Branch watershed as part of the LOMR
study, several other basins must be considered as part of the interior drainage analysis required to
"certify" the levee. These include Shiras Avenue, Roosevelt Street, Hamilton Street, Dock Street,
Eight Street, Ice Harbor, Dodge Street, and Maus Park.
Engineering staff will require time to review the US Army Corp of Engineer's (USACE)
floodwall /levee analysis, the structural analysis being performed by a consultant, and the interior
drainage analysis prior to certifying the levee by the May 17, 2011 deadline. As a result, time
limitations preclude going through a proposal review process to select a consultant for the interior
drainage analysis. The need to hire a consultant to perform an interior drainage analysis was not
confirmed until Engineering staff had time to review the work performed by the USACE. Their
report indicated that they were performing the analysis. However, the USAGE indicated at a later
date that they did not have the expertise to complete the analysis; it would be left to the City.
Due to the impending levee certification deadline, CDM was asked to submit a proposal for two
reasons. CDM is very familiar with the available data required to do the analysis having already
undertaken a similar task in conjunction with the LOMR study. The engineering analyses
performed by CDM as part of the LOMR study is the same analysis required for the interior
drainage study required for levee certification. Therefore, they would be able to perform the work in
the schedule demanded by the deadline. And CDM has extensive experience performing similar
studies for other communities.
CDM has proposed to analyze the eight (8) additional drainage areas for a fee not to exceed
$69,300.00.
Engineering staff believe that this cost is appropriate for the amount of work required to perform
the interior drainage study.
RECOMMENDATION
I recommend amending the City's contract with CDM to include the interior drainage study required
for levee certification.
BUDGET IMPACT
Funding for the additional scope of work will come from the FY11 CIP Budget appropriation in the
amount of $140,000 for Flood Control Levee Certification (CIP #7202155). These funds are also
being used to fund the required structural analysis leaving $36,000 for the interior drainage
analysis. Therefore, additional funds required to complete the interior drainage analysis will come
from CIP #7201066 General Storm Sewer Repairs.
ACTION TO BE TAKEN
I respectfully request authorization to amend the City's agreement with CDM to include the interior
drainage study required as a prerequisite for levee certification
Attachs.
cc: Jenny Larson, Budget Director
Laura Cartsens, Planning Services manager
Don Vogt, Public Works Director
John Klostermann, Street and Sewer Maintenance Supervisor
Bob Schiesl, Assistant City Engineer
Deron Muehring, Civil Engineer II
330 East Kilbourn Avenue, Suite 1219
Milwaukee, Wisconsin 53202
tel: 414 - 291 -5100
fax: 414 - 291 -2765
December 16, 2010
Mr. Deron Muehring
Engineering
City of Dubuque
50 West 13th Street
Dubuque, IA 52001 -4864
Subject: Proposal and Scope of Services: Interior Drainage Analysis for the
Local Flood Protection System
Dear Mr. Muehring:
CDM is pleased to provide the City of Dubuque with this proposal to assist you with
engineering services associated with interior drainage analysis of your Local Flood Protection
Project (LFPP) along the Mississippi River. CDM understands that the City is in the process of
certifying the LFPP that was built to protect it from Mississippi River flood stages. One of the
requirements for the LFPP certification from FEMA is to develop interior drainage analysis
for the basins behind the LFPP. Based on our knowledge of the City's drainage system and
our experience with the development and review of interior drainage analysis studies, we
have prepared the attached scope, fee and schedule for your consideration.
Qualifications and Relevant Experience
As requested, we have included a summary of our relevant experience and qualifications to
assist the City with these services. If you need additional details or individual project
descriptions, they can be provided to you.
CDM brings the required expertise to help you achieve a successful completion of this interior
drainage analysis study and your LFPP certification, including:
• Knowledge of FEMA Requirements. CDM has a contract with FEMA in several regions to
provide support for its Risk MAP program which is a continuation of its Map
Modernization program. Under that contract we recently reviewed six interior drainage
analysis studies for FEMA Region I. Our technical reviewers are well versed in the
requirements for the completion and approval of interior drainage analysis studies. They
Mr. Deron Muehring
December 16, 2010
Page 2
will provide a technical direction and review of the completed study to facilitate a swift
review and subsequent approval.
CDM has significant experience working with FEMA on assignments that have included
interior drainage analysis and mapping in areas that include LFPPs. Our experience during
FEMA's Map Modernization Program included work for four FEMA regions when
national levee policy was being developed and refined and when the broad
implementation of FEMA's levee certification requirements occurred. Currently, CDM is
one of three contractors under FEMA's Risk MAP program that continues to support
FEMA's efforts to improve the nation's flood risk inventory.
• Interior Drainage Analysis Preparation. CDM has assisted various cities, counties,
agencies and municipalities in developing interior drainage analyses. These studies were
used for, but not limited to; certification of LFPP; design and construction of LFPP; design
and construction of interior drainage facilities; and planning studies for interior drainage
basins. Below are a sampling of current and completed projects by CDM;
1. City of New Orleans, La. - CDM is currently assisting the City of New Orleans to
develop a City -wide Drainage Master Plan. The City drainage system includes 15
major drainage basins that are behind the LFPP, and are each drained by large
storm water pump stations. The CDM - developed master plan will help guide the
City to reduce existing flooding to a desired level of service.
2. Tarrant Regional Water District, Fort Worth, Tx. - In an ongoing project, CDM is
assisting the Tarrant Regional Water District and U.S. Army Corps of Engineers
(USACE) to relocate a segment of the Trinity River, near downtown Forth Worth,
by construction of a bypass channel and supporting infrastructure. CDM
completed a preliminary design of a floodway bypass channel and LFPP, three
major flood isolation gates, a controlled backwater channel dam with seven
hydraulically- operated leaf gates, valley storage mitigation sites, ecosystem
restoration and four major roadway bridges.
3. St. Bernard Parish, La. - CDM was selected by the USACE to design and construct
three pump stations that will be used to pump the flows from interior drainage
basins. CDM performed hydrology and hydraulic analysis of the interior drainage
basins to design the capacities of the pump stations.
Mr. Deron Muehring
December 16, 2010
Page 3
4. Lowell Flood Protection, Lowell, Mass. - CDM was retained by the City of Lowell
to assist in the re- listing and accreditation of the Lowell LFPP in accordance with
FEMA criteria.
5. Ascension Parish, La. - CDM completed a hydrologic and hydraulic study of the
Henderson Bayou Basin in Ascension Parish. The hydraulic analysis yielded
several recommendations for flood control improvements, including a major
LFPP, flood gate and pump station to mitigate flooding.
6. Pharmaceutical Corporation, Colo. - To address concerns regarding FEMA
compliance, a major Pharmaceutical Corporation selected CDM to evaluate and
certify the LFPP around the facility.
7. Laurel Ridge Levee Extension Project, Ascension Parish, La. - CDM was retained
by Ascension Parish's East Ascension Consolidated Gravity Drainage District to
perform design services for the Laurel Ridge Levee Extension Project.
8. Lincoln Airport Authority, Kansas City, Kan. - CDM has performed interior
drainage analysis for the Lincoln Airport Authority and recommended
improvements to mitigate interior drainage flooding.
Please review the attached scope, fee, and schedule. We believe our proposal will achieve
your project goals, and we look forward to talking with you further on this project.. If you
have any questions, please contact me by any of these methods: email: laudh @cdm.com,
office: (414) 203 -4002 or cell: (414) 559-8890. Or contract Susen Gali directly at - email:
galisk @cdm.com or by phone: 312 - 504 -8896.
Very truly yours,
Daniel H. Lau, P.E., BCEE, D.WRE
Vice President
Camp Dresser & McKee Inc.
e
AMENDMENT NO: I
TO AGREEMENT
BETWEEN
OWNER AND ENGINEER
This Amendment No: 1 is made and entered into this day of , 2011 to the Agreement between
Camp Dresser & McKee Inc. ( "ENGINEER ") and City of Dubuque, IA ( "OWNER ") dated October 27' 2010, ( "the
Agreement ").
WHEREAS, ENGINEER and OWNER entered into the Agreement for the Letter of Map Revision Study, and
WHEREAS, the parties desire to amend the Agreement so as to amend the scope of work, time periods of
performance and payment, and/or responsibilities of OWNER; and
WHEREAS, the Agreement provides that any amendments shall be valid only when expressed in writing and
signed by the parties.
NOW THEREFORE, in consideration of the mutual understandings and Agreements contained herein, the
parties agree to amend the Agreement as follows:
1. The Basic Services of ENGINEER as described in the Agreement are amended and supplemented as follows:
The scope of services is attached to this Amendement 1 as Attachement A.
2. The responsibilities of OWNER as described in the Agreement are amended and supplemented as follows:
The scope of services is attached to this Amendement I as Attachement A.
3. The time periods for the performance of ENGINEER's services as set forth in the Agreement are amended and
supplemented as follows:
The Amendment I completion date is March 11'", 2011
4. The payment for services rendered by ENGINEER shall be as set forth below:
Original contract budget - $48,918.00
Completed out of scope work budget - $2,765.37
Contract Amendment 1 budget - $69,300.00
Contract upper limit budget - $120,983.37
7/2006 1
5, Except as herein modified, all terms and conditions of the Agreement shall remain in full force and effect.
IN WITNESS WHEREOF, the parties hereto have executed this amendment on the date indicated above for the purpose
herein expressed.
ENGINEER
DATE: January 4, 2011
OWNER
DATE: /7167/7
4/01
I
CDM
ATTACHMENT A
City of Dubuque
Interior Drainage Analysis
Scope of Work, Schedule and Fee
General
This document describes the scope of work for professional engineering services for the City of
Dubuque, Iowa.
Background and Purpose
The City of Dubuque (City), Iowa, is in the process of certifying the Local Flood Protection
Project (LFPP) along the Mississippi River. The LFPP was built to protect the City from
Mississippi River flood stages. The LFPP extends from a location downstream of the former
Eagle Point Bridge to approximately i000 feet below Maus Park Lake.
One of the requirements for the LFPP certification from FEMA is to develop an interior
drainage analysis for the basins behind the LFPP. There are nine basins behind the LFPP that
discharge stormwater to the Mississippi River. These basins include:
• Shiras Avenue
• Roosevelt Street
• Hamilton Street
• Dock Street
• Bee Branch
• Eight Street
• Ice Harbor
• Dodge Street
• Maus Park
In response to City's request to provide a scope of services for developing interior drainage
analysis for the above nine basins, CDM has developed the following scope of work as detailed
in the tasks below. The proposed scope of work is divided into the following tasks for all the
nine basins:
• Task i - Collect Data and Review Existing Models
• Task 2 - Develop /Update Hydrology and Hydraulic Models
1
Task 1— Collect Data and Review Existing Models
The City will provide the following data to CDM;
• Task 3 - Determine Joint Probability Storm Event to Perform Interior Drainage Analysis
• Task 4 - Develop Interior Drainage Analysis Report for FEMA Submittal
City of Dubuque
Interior Drainage Analysis
Scope of Work, Schedule and Fee
CDM has already collected hydrology and hydraulic (H &H) models for the nine basins developed by the
Rock Island District Corps of Engineers. CDM will contact the City to collect any additional data needed
to develop the interior drainage analysis, such as storm sewer as -built drawings, pump curves, detention
basins stage- storage curves and the LFPP operation and maintenance manual (O&M). The existing H &H
models for the eight basins - except for the Bee Branch Basin - will be reviewed to determine if the H &H
models are compliant with FEMA guidelines (FEMA Guidelines and Specifications, Appendix C, Riverine
Analysis and Mapping). The H &H model for Bee Branch Basin was developed by CDM for the City's
LOMR study, and will be used as a base model for the interior drainage analysis.
• Storm sewer as -built plans
• Pump curves for all the pump stations
• Stage- storage curves for all the detention basins
• Operation procedures for all the gates, pumps, & detention basins.
At the beginning of the project CDM project engineer will visit the nine basins to observe the drainage
patterns, basin characteristics and operation of the interior drainage facilities.
Task Deliverables
• Technical memorandum summarizing the findings from the review of the existing H &H models and
available data
Task 2 — Develop /Update Hydrology and Hydraulic Models
Based on the review findings from Task i, CDM will follow the approach described below to
develop /update the H &H models for the remaining eight basins:
Hydrology Models
Basin hydrology for the eight basins will be developed using the combination of ArcHydro, HEC- GeoHMS
extensions to Arc GIS Version 9.3 and EPA's Stormwater Management Model (SWMM) Version 5.0. The
following data will be provided by the City to model the basin hydrology for the eight basins;
• 2009 Topographic Data
• Land Use Cover
• Soils Data
• Detention Basin Rating Curves.
City's 2009 topographic data will be used to delineate the subbasins for each basin. The curve numbers
(CN) for the subbasins will be assigned using the available land cover and soils data. Detention basins will
also be included to represent the storage conditions in the basins; this representation is subject to
2
i
City of Dubuque
Interior Drainage Analysis
Scope of Work, Schedule and Fee
available stage- storage curves from the City. These subbasins and hydrologic parameters will primarily be
developed using the combination of ArcHydro and HEC- GeoHMS. Once developed, the subbasins and
hydrologic parameters of each basin will be imported in to SWMM. The Soil Conservation Service (SCS)
CN loss module will be used with the SCS Unit Hydrograph methodology within SWMM to generate
hydrographs.
Hydraulic Models
Existing hydraulic models for the eight basins were developed by United States Army Corps of Engineers
(ACOE) using SWMM. These models will be updated based on the findings from Task 1. Updates will
include, but are not limited to: storm sewer sizes and shapes, detention basins, pump stations, pump
curves and storage curves, which will be provided by the City. CDM assumes that storm sewer models can
be developed using the existing models and storm sewer as- builts, and no additional field survey is
required.
Validation of H &H Models
CDM will validate the H &H models with the available high water mark and historic flood data from the
City. If no such data is available, CDM will co- ordinate with Iowa Department of Natural Resources
(IDNR) to validate the basin flows. After the validation, the hydraulic models will be used for interior
drainage analysis.
Task Deliverables
• Draft report section on the development of H &H models and validation results from the H &H
models
Task 3 — Determine Joint Probability Storm Event to
Perform Interior Drainage Analysis
A coincident frequency analysis will be performed to determine the joint probability storm event for the
interior and exterior drainage areas. The U.S. Army Corps of Engineers' Engineer Manual, "Hydrologic
Analysis of Interior Areas" (EM 1110 -a -1413) provides guidance for a "Coincident Frequency Method" of
analysis which computes the percent chance exceedance frequencies of various interior flooding
elevations based on the probabilities of exceeding given exterior river stages during different interior
storm events. Coincidence is the degree to which the interior and exterior events occur at the same time.
The Coincident Frequency analysis provides a method to compute the joint probability of interior and
exterior flooding and to determine the base flood elevation for interior areas.
This identified storm event represents or equals a 1- percent annual- chance storm, and will generate the
peak flows and stages in the interior drainage. These peak flows and stages will also identify the capacity
deficiencies of the interior drainage facilities behind the levee and will establish Base Flood Elevations
(BFEs) for the nine basins. These BFEs will be used with the City's topographic information to delineate
the floodplain boundaries behind the levee for the nine basins.
This analysis will be performed using the available established water surface elevations data for the
Mississippi River. Analysis of the Mississippi River is not included in the scope. CDM will coordinate with
FEMA regarding guidelines to follow and also to obtain an agreement with the coincident frequency
analysis results.
CDM
3
Task Deliverables
• Draft report section on the interior drainage analysis results
• Workmaps representing any floodplain boundaries for the nine basins
City of Dubuque
Interior Drainage Analysis
Scope of Work, Schedule and Fee
Task 4 — Develop Interior Drainage Analysis Report for
FEMA Submittal
CDM will compile all the information required by FEMA into one (1) report. Two (2) hard copies of the
final report, including H &H models in a CD and one (i) digital copy in PDF, will be provided to the City.
Task 5— Prepare Preliminary Floodplain Map for Bee
Branch Watershed
CDM will prepare preliminary floodplain map from the existing models of Bee Branch Watershed
(previously completed task).
Schedule
Assuming a start date of January io, 2ou, CDM can complete the work by March rr, 20n. The following is a
breakdown of the major milestones.
Project Schedule
Milestone
Tasks Task Description Date
Estimated Project Costs
1 Collect and Review Existing Models
2 Develop /Update Hydrology and Hydraulic Models
Determine Joint Probability Storm Event to Perform Interior Drainage
3 Analysis 3/04/2011
4 Develop Interior Drainage Analysis Report for FEMA Submittal 3/11/2011
For the work associated with the described scope of work, the City agrees to pay CDM on a time and
materials basis at a not -to- exceed fee of $69,300. The attached spreadsheet presents a detailed cost
breakdown. The fee ($2,765.37) for Task 5 was invoiced and paid by the City.
1/21/2011
2/11/2011
4
TASK
NO.
STUDY PROJECT TASKS
PROJECT
MANAGER
QA /QC
(Technical
Advisor)
SENIOR
PROJECT
ENGINEER
GIS/
DRAFTING
ADMIN
EXPENSES
TASK TOTAL
1
COLLECT DATA AND REVIEW EXISTING MODELS
$1
Data Collection & Review
16
Review of Existing Models (GEO -HMS, WMS & SWMMI
24
8
Prepare Technical Memorandum on the Review of Existing Models
2
8
2
Site Visit to the Nine Basins
12
2
DEVELOP /UPDATE HYDROLOGY AND HYDRAULIC MODELS
$28,630.31
Develop/Update Hydrology Models
8
128
16
Develop/Update Hydraulic Models
4
8
64
16
4
Prepare Report Section On Development of H &H Models and Results
3
DETERMINE JOINT PROBABILITY STORM EVENT / PERFORM INT. DRAINAGE ANALYSIS
$20,879.89
FEMA Coordination
4
4
108
Develop Joint Probability Storm Event & Perform Interior Drainage Analysis
9
Prepare Report Section on Interior Drainage Analysis Results
4
18
36
4
4
DEVELOP INTERIOR DRAINAGE ANALYSIS REPORT for FEMA SUBMITTAL
$8,140.74
Interior Drainage Analysis Report
4
54
9
8
TOTAL
14
53
436
69
18
$1,400 00
$69,300.00
Project Budget
CAMP, DRESSER S MCKEE
City of Dubuque December 16. 2010
Interior Drainage Analysis
ti