R7D-Approve Desired Minimum Elevation For The Crown Of Roads In The CityCOMMISSION 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 ln The City To Be One Foot Higher Than The
Tailwater Boundary Condition Elevation Established By The Mayor And City Commission To Allow For
Drainaqe Within The Citv And Protection From Tidal
lntended Outcome Su
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.
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. The result will allow the City to maintain better drainage for safer
travel during potential flooding events. lt 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.
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 of the Stormwater Management Master Plan for all tidal
boundary conditions.
Bergeron Land Development, lnc. (Bergeron) is currently working on a project on WestAvenue, from Sth 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 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. ln 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 initialconcerns
could be dlscussed. 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.
Financial lnformation :
Financiat lmpact Summary:
Citv Clerk's Office lative
Eric Carpenter, Public Works X6012
Siqn-Offs:
Department pirector Assistant ffi[f$pager City M nager
ETC ?(MT [X- ,v/JLM i .\\
'€01 5Uanuary\PUBLIC WORKS\Elevation. Sum.docT:\AGENDA
AGENDA ITEIII
DATEE MIAMIBEACH 468
g MIAMIBEACH
City of Miqmi Beoch, 1700 Convention Center Drive, Miomi Beoch, Florido 33139, www.miomibeochfl.gov
COMMIS ION MEMORANDUM
TO:Mayor Philip Levine and Member of the City
FROM: Jimmy Morales, City Manager
DATE: January 14,2015
SUBJECT: A RESOLUTION OF THE MAYOR AND CITY COMMISSION OF THE CITY OF MIAMI
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.
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 willwork 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.
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. The result will allow the City to maintain better
drainage for safer travel during potential flooding events. lt 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.
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 of the Stormwater Management Master
Plan for all tidal boundary conditions.
ln accordance with the reasons listed above, the Public Works Department is recommending the
crown of road to be a minimum of one foot above the tailwater design elevation.
Bergeron Land Development, lnc. (Bergeron) is currently working on a project on West Avenue,
from Sth 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 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
469
City Commission Memorandum - Sfreef Elevations
January 14,2015
Page 2 of 2
that will be less susceptible to flooding. A typical design section is attached for four separate
locationsiscenarios with i n 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. ln 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.
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