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2015-28921 Reso RESOLUTION NO. 2015-28921 A RESOLUTION OF THE MAYOR AND CITY COMMISSION OF THE CITY OF MIAMI BEACH, FLORIDA, ACCEPTING THE RECOMMENDATION OF THE MAYOR'S BLUE RIBBON PANEL ON FLOODING AND SEA RISE, AND APPROVING A DESIRED MINIMUM ELEVATION FOR THE CROWN OF ROADS IN THE CITY TO BE ONE FOOT (1') HIGHER THAN THE TAILWATER DESIGN CRITERIA, FOR PROPER DRAINAGE WITHIN THE CITY AND PROTECTION FROM TIDAL FLOODING. WHEREAS, at its February 12, 2014 meeting, the City Commission approved the recommendation of the Mayor's Blue Ribbon Panel on Flooding and Sea Rise to amend the Stormwater Management Master Plan's tailwater elevation design criteria from 0.5 FT-NAVD to 2.7 FT-NAVD,which dictates a higher crown of road elevation than what exists in some of the areas of the City; and WHEREAS, at its January 13, 2015 meeting, the Mayor's Blue Ribbon Panel on Flooding and Sea Rise unanimously approved a desired minimum elevation for the crown of roads in the City to be one foot (1') higher than the tailwater design criteria; and WHEREAS, the recommended elevation will maximize the effectiveness of City drainage systems and minimize flooding on the streets, and will set elevations of the cross section of the road in order to maintain better drainage and storm water inlet for safer travel during potential flooding events that may occur; and WHEREAS, in order to maintain access to adjacent properties and obtain the overall desired infrastructure, a harmonization or transition from the proposed roadway elevation down to an existing finished floor elevation will be required in some cases. NOW, THEREFORE, BE IT DULY RESOLVED BY THE MAYOR AND THE CITY COMMISSION OF THE CITY OF MIAMI BEACH, FLORIDA,that the Mayor and City Commission hereby accept the recommendation of the Mayor's Blue Ribbon Panel on Flooding and Sea Rise, and approve a minimum elevation for the crown of roads in the City to be one foot(1') higher than the tailwater design criteria, for proper drainage within the City and protection from tidal flooding. PASSED AND ADOPTED � .;" w v ,,,,a y of F I614 s ,....... ATTEST: r/ * -� *� =.►NCORP ORATE /'Philip ,r e p;Mayor Rafa- Granado, City CI-rk � � ' I f 444/9C1-4 0E6 City Attorney Date APPROVED AS TO FORM&LANGUAGE T:\AGENDA\2015\January\PUBLIC WORKS\Elevation.reso.doc &FOR ON z -3 — 1S City Manley Date COMMISSION ITEM SUMMARY Condensed Title: A Resolution Of The Mayor And City Commission Of The City Of Miami Beach, Florida, Approving A Desired Minimum Elevation For The Crown Of Roads In The City To Be One Foot Higher Than The Tailwater Boundary Condition Elevation Established By The Mayor And City Commission To Allow For Proper Drainage Within The City And Protection From Tidal Flooding. Key Intended Outcome Supported: I Well maintained infrastructure Item Summary/Recommendation: The City is heavily investing in infrastructure improvements in order to mitigate flooding and meet the challenges of sea level rise. The benefits from having new storm water pump stations,check valves, and raising streets with low elevation will work collectively to maximize the effectiveness of these drainage systems and minimize flooding on the streets. A new minimum standard for the crown of road will set elevations of the cross section of the road. . Resolution 2014-28499 was passed by City Commission on February 12,2014 which modified the tailwater elevation from 0.5 feet NAVD to 2.7 feet NAVD in the Stormwater Management Master Plan for all tidal boundary conditions. The result of this modification creates a condition where engineering principles dictate that inlet elevations be set no lower than the 2.7 feet NAVD. Since the inlets are placed at the lowest point in the road, the crown of road will typically be a minimum of four to eight inches above that elevation. Setting the crown of road one foot above the tailwater criteria is already consistent with the prior direction. Not all roads in the City are below the proposed elevation, but there are some that have been historically prone to flooding due to tidal events. Setting this criteria will allow the City to maintain better drainage for safer travel during potential flooding events. It will also extend the useful life of these new roads by raising the base foundation material such that it will not be saturated with water, reducing cost for reconstruction in the future and less construction impacts in our neighborhoods. The City is currently working on a project on West Avenue,from 5th to 8th Streets,the short section on 6th Street, between Alton and West Avenue,as well as a project on 17th Street, between Alton and the bridge and a section of West Avenue,from Lincoln Road up to 17th Street. As part of the project, Bergeron Land Development Inc. (Bergeron) has been assisting the City in developing concepts related to street elevations, which will be required in order to raise the streets to a level that will be less susceptible to flooding. A typical design section is attached for four separate locations/scenarios within this project area. At the December 10,2014 Flooding Mitigation Committee meeting, a presentation of these four scenarios was made by Bergeron regarding the existing road conditions and the result of raising the roadway, in relation to the finished floor elevation of the adjacent properties. In order to maintain access to those businesses and obtain the overall desired infrastructure, a harmonization or transition from the proposed roadway elevation down to an existing finished floor elevation will be required in some cases. During the presentation different harmonization alternatives were presented to the Committee so that initial concerns could be discussed. The Committee talked through the concerns with the alternatives presented and requested that this item be brought to a full Commission for further discussion. THE ADMINISTRATION RECOMMENDS ADOPTING THE RESOLUTION. Advisory Board Recommendation: Financial Information: Source of Amount Account Approved Funds: 1' OBPI Total Financial Impact Summary: City Clerk's Office Legislative Tracking: Eric Carpenter, Public Works X6012 Sign-Offs: Department Director Assistananager City t nager ETC JLM 411 T:\AGENDA\2015\February\PUBLIC WORKS\Elevation.Sum., M1AMIBEAC1H AG ENDA ITEfu9 R?C DANE .•/-1/—/ MIAMI BEACH City of Miami Beach, 1700 Convention Center Drive,Miami Beach, Florida 33139,www.miamibeachfl.gov COMMIS /ION MEMORANDUM I TO: Mayor Philip Levine and Memb:, s of the City •,mmission FROM Jimmy Morales, City Manager I _ -- DATE: February 11, 2015 SUBJECT: A RESOLUTION OF THE MA '.•R AND CITY COMMISSION OF THE CITY OF MIAMI BEACH, FLORIDA, ACCEPT!'.G THE RECOMMENDATION OF THE FLOODING MITIGATION COMMITTEE, KNOWN AS THE (SUSTAINABILITY AND RESILIENCY COMMITTEE), AND APPROVING A DESIRED MINIMUM ELEVATION FOR THE CROWN OF ROADS IN THE CITY TO BE ONE FOOT (1') HIGHER THAN THE TAILWATER DESIGN CRITERIA, FOR PROPER DRAINAGE WITHIN THE CITY AND PROTECTION FROM TIDAL FLOODING. BACKGROUND The City is heavily investing in infrastructure improvements in order to mitigate flooding and meet the challenges of sea level rise. The benefits from having new storm water pump stations, check valves, and raising streets with low elevation will work collectively to maximize the effectiveness of these drainage systems and minimize flooding on the streets. A new minimum standard for the crown of road will set elevations of the cross section of the road. Resolution 2014-28499 was passed by City Commission on February 12, 2014 which modified the tailwater elevation from 0.5 feet NAVD to 2.7 feet NAVD in the Stormwater Management Master Plan for all tidal boundary conditions. The result of this modification creates a condition where engineering principles dictate that inlet elevations be set no lower than the 2.7 feet NAVD. Since the inlets are placed at the lowest point in the road,the crown of road will typically be a minimum of four to eight inches above that elevation. Setting the crown of road one foot above the tailwater criteria is already consistent with the prior direction. Not all roads in the City are below the proposed elevation, but there are some that have been historically prone to flooding due to tidal events. Setting this criteria will allow the City to maintain better drainage for safer travel during potential flooding events. It will also extend the useful life of these new roads by raising the base foundation material such that it will not be saturated with water, reducing cost for reconstruction in the future and less construction impacts in our neighborhoods. The City is currently working on a project on West Avenue,from 5th to 8th Streets,the short section on 6th Street, between Alton and West Avenue, as well as a project on 17th Street, between Alton and the bridge and a section of West Avenue, from Lincoln Road up to 17th Street. As part of the project, Bergeron Land Development Inc. (Bergeron) has been assisting the City in developing concepts related to street elevations, which will be required in order to raise the streets to a level that will be less susceptible to flooding. A typical design section is attached for four separate locations/scenarios within this project area. City Commission Memorandum-Street Elevations February 11, 2015 Page 2 of 2 At the December 10, 2014 Flooding Mitigation Committee meeting, a presentation of these four scenarios was made by Bergeron regarding the existing road conditions and the result of raising the roadway, in relation to the finished floor elevation of the adjacent properties. In order to maintain access to those businesses and obtain the overall desired infrastructure, a harmonization or transition from the proposed roadway elevation down to an existing finished floor elevation will be required in some cases. During the presentation different harmonization alternatives were presented to the Committee so that initial concerns could be discussed. The Committee talked through the concerns with the alternatives presented and requested that this item be brought to a full Commission for further discussion. CONCLUSION The Administration recommends adopting the Resolution. JM/MT/ JJF/BAM/FRS T:WGENDA\2015\February\PUBLIC WORKS\Elevation.memo.doc III W Q. Z =z !! ay \ 2 °04' 1. 0 - —_ F E— CL ti+�p ,' i Q --) Cam,ix LA • Q L i I I-- 0– '",etiti,, --- --=. 2 (1. N L1.1 P Z' ® , �pW U I w w� L�J Q :� > c J , Q i CZ -7----4--„:I--- O 1- .1. �z. 1 0 Via, II 1 Li i; I I i, ` g t• C f -a, I 6b "�' 7� I a q z D w. I >-. '� ..eti,n W Q y >" — ��+. 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