2014-28499 Reso RESOLUTION NO. 2014-28499
A RESOLUTION OF THE MAYOR AND CITY COMMISSION OF THE CITY OF
MIAMI BEACH, FLORIDA, APPROVING THE RECOMMENDATION OF THE
FLOODING MITIGATION COMMITTEE TO AMEND THE CITY'S STORMWATER
MANAGEMENT MASTER PLAN (AS ADOPTED BY THE CITY COMMISSION ON
NOVEMBER 14, 2012, PURSUANT TO RESOLUTION No. 2012-28068), BY
MODIFYING THE DESIGN CRITERIA FOR THE TAILWATER ELEVATION FROM
0.6 FT-NAVD, TO 2.7 FT-NAVD FOR ALL TIDAL BOUNDARY CONDITIONS.
WHEREAS, the City's Stormwater Management Master Plan (SWMMP) is intended to be a
guide for improving the City's stormwater management system performance for the next 20 years,
with considerations of potential sea level change (SLC) over 20-years of stormwater infrastructure
and a 50-year planning horizon for seawall heights; and
WHEREAS, at its regular meeting on November 14, 2012, the City Commission approved
Resolution No. 2012-28068, approving the City's SWMMP; and
WHEREAS, at its January 28, 2014 meeting, the Flooding Mitigation Committee
unanimously voted to recommend changing the SWMMP tailwater elevation design criteria from 0.5
ft-NAVD, to 2.7 ft-NAVD for all tidal boundary conditions; and
WHEREAS, the discussion and formulation of this criteria was initiated at the January 21,
2014 meeting of the Mayor's Blue Ribbon Panel on Flooding, whre the Panel suggested working
with peak tidal values rather than mean values; and
WHEREAS, the Public Works Department recommends approval of this new tailwater design
criteria of 2.7 ft-NAVD, based upon peak historical tidal values and published ACOE data regarding
sea level rise as the next step in The City's ongoing efforts to combat flooding within the City limits;
and
WHEREAS, currently there are three (3) neighborhoods in active construction: Central
Bayshore (70% complete); Lake Pancoast (95% complete); and Venetian Islands (10% complete);
and
WHEREAS, additionally, a design-build contract has been awarded for Lower North Bay
Road neighborhood, and the Palm & Hibiscus Islands Neighborhood is currently in the negotiation
process for design-build services; and
WHEREAS, the aforestated recommended design criteria may have a significant impact on
the design and construction of the above referenced projects.
NOW, THEREFORE, BE IT DULY RESOLVED BY THE MAYOR AND THE CITY
COMMISSION OF THE CITY OF MIAMI BEACH, .FLORIDA, the Mayor and City Commission
hereby the recommendation of the Flooding Mitigation Committee to amend the City's Stormwater
Management Master Plan (as adopted by the City Commission on November 14, 2012, pursuant to
Resolution No. 2012-28068), by modifying the design criteria for the tailwater elevation from 0.5 ft-
NAVD, to 2.7 ft-NAVD for all tidal boundary conditions.
PASSED AND ADOPT th day of February, 2014.
ATTEST: •••• �' ~
Ma Levine, Mayor
APPROVED AS TO
Rafael ranado, City :INCORP ORATED= FORM & LANGUAGE
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'y Attorney a Date
COMMISSION ITEM SUMMARY
Condensed Title:
A Resolution Of The Mayor And City Commission Of The City Of Miami Beach, Florida, Approving The
Recommendation Of The Flooding Mitigation Committee To Amend The Stormwater Management Master
Plan (Commission Adopted November 14, 2012) By Modifying The Design Criteria For The Tailwater
Elevation From 0.5 Ft-NAVD To 2.7 Ft-NAVD For All Tidal Boundary Conditions.
Key Intended Outcome Supported:
N/A
Supporting Data(Surveys, Environmental Scan, etc:
Item Summa /Recommendation:
At its January 28, 2014 meeting, the Flooding Mitigation Committee unanimously voted to recommend
changing the Stormwater Management Master Plan (Commission adopted November 14, 2012) tailwater
elevation design criteria from 0.5 ft-NAVD to 2.7 ft-NAVD for all tidal boundary conditions. The tailwater
elevation design criteria approved in the Stormwater Management Master Plan is 0.5 feet-NAVD.
The discussion and.formulation of this criteria was accomplished during the January 21, 2014 meeting of
the mayor's Blue Ribbon Panel on Flooding. The Panel discussion suggested working with peak tidal
values rather than mean values. A peak tidal elevation of 2.1 ft-NAVD was selected based upon historical
data. An additional 7 inches of projected sea level rise based upon data published by the United States
Army Corp of Engineers (ACOE) was added to the 2.1 to reach a final figure of 2.7 NAVD. The Public
Works Department recommends approval of this new tailwater design criteria of 2.7 NAVD based upon
peak historical tidal values and published ACOE data regarding sea level rise as the next step in our
ongoing efforts to combat flooding within the City of Miami Beach.
Currently there are three (3) neighborhoods in active construction: Central Bayshore (70% complete),
Lake Pancoast (95% complete), and Venetian Islands (10% complete). A Design-Build contract has been
awarded for Lower North Bay Road neighborhood. The Palm & Hibiscus Islands Neighborhood is
currently in the negotiation process for Design-Build Services.
This new criteria may have a significant impact on the design and construction of the above referenced
projects. The City shall determine if these criteria shall be applicable to these projects
THE ADMINISTRATION RECOMMENDS APPROVING THE RESOLUTION.
Advisory Board Recommendation:
N/A
Financial Information:
Source of Amount Account
Funds:
OBPI 1
2
Total
Financial Impact Summary: Based upon some very preliminary estimates, the Public Works Department
believes this would add approximately $150M - $200M to the cost of the roadway and neighborhood
stormwater improvements above the funding requirements already identified by the Stormwater
Management Master Plan. An additional 30-40 pump stations will be required, which will also raise issues
of the location in neighborhoods.
City Clerk's Office Legislative Tracking:
Sign-Offs: Departm t Assistant Ci nager City Manager
Direct
ETC DM ZI MT JL
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City of Miami Beath, 1700 Convention Center Drive,Miami Beach, Florida 33139,www.miamibeachfl.gov
COMMISSION MEMORANDUM
TO: Mayor Philip Levine and Members of he City C mmission
FROM: Jimmy L. Morales, City Manager
DATE: February 12, 2014
SUBJECT: A RESOLUTION OF THE MAYOR D CITY COMMISSION OF THE CITY OF MIAMI
BEACH, FLORIDA, APPROVING HE RECOMMENDATION OF THE FLOODING
MITIGATION COMMITTEE TO AME D THE STORMWATER MANAGEMENT MASTER
PLAN (COMMISSION ADOPTED NOVEMBER 14,2012)BY MODIFYING THE DESIGN
CRITERIA FOR THE TAILWATER ELEVATION FROM 0.5 FT-NAVD TO 2.7 FT-NAVD
FOR ALL TIDAL BOUNDARY CONDITIONS.
BACKGROUND
At its January 28, 2014 meeting, the Flooding Mitigation Committee unanimously voted to
recommend changing the Stormwater Management Master Plan(Commission adopted November
14, 2012)tailwater elevation design criteria from 0.5 ft-NAVD to 2.7 ft-NAVD for all tidal boundary
conditions. The tailwater elevation design criteria approved in the Stormwater Management Master
Plan is 0.5 feet-NAVD.
The discussion and formulation of these criteria was accomplished during the January 21, 2014
meeting of the mayor's Blue Ribbon Panel on Flooding. The Panel discussion suggested working
with peak tidal values rather than mean values. A peak tidal elevation of 2.1 ft-NAVD was selected
based upon historical data. An additional 7 inches of projected sea level rise based upon data
published by the United States Army Corp of Engineers (ACOE)was added to the 2.1 to reach a
final figure of 2.7 NAVD. The Public Works Department recommends approval of this new tailwater
design criteria of 2.7 NAVD based upon peak historical tidal values and published ACOE data
regarding sea level rise as the next step in our ongoing efforts to combat flooding within the City of
Miami Beach.
ANALYSIS
Currently there are three (3) neighborhoods in active construction: Central Bayshore (70%
complete), Lake Pancoast(95% complete), and Venetian Islands(10% complete).A Design-Build
contract has been awarded for Lower North Bay Road neighborhood. The Palm&Hibiscus Islands
Neighborhood is currently in the negotiation process for Design-Build Services.
This new criteria may have a significant impact on the design and construction of the above
referenced projects. The City shall determine if these criteria shall be applicable to these projects.
FINANCIAL IMPACT
Based upon some very preliminary estimates,the Public Works Department believes this would add
approximately $150M - $200M to the cost of the roadway and neighborhood stormwater
improvements above the funding requirements already identified by the Stormwater Management
Master Plan. An additional 30-40 pump stations will be required,which will also raise issues of the
location in neighborhoods.
CONCLUSION
The Administration recommends adoption of the Resolution.
JLM/ C/DM/BAM/DS
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