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THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGN
Brent Whitfield, P.E.Director of Water Resources
&Patrick D. Kaimrajh, P.E.
Senior Engineer
December 8, 2017
ABOUT US
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
Founded in 1986
SERVICES Stormwater Modeling &
Design Utility Engineering Design-Build Delivery Land Development Transportation Landscape Architecture Parks & Recreation Institutional & Educational
ABOUT US
Brent Whitfield, P.E.Director of Water Resources
14+ Years of Water Resources, Hydrologic & Hydraulic Engineering, Design, Permitting, and Construction Experience
Patrick Kaimrajh, P.E.Senior Engineer
9+ Years of Stormwater, Utilities, and Land Development Engineering, Design, Permitting, and Construction Experience
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
PROJECT BACKGROUND: IN THE NEWS
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
City’s first Stormwater Management Master Plan (SWMMP) in 1997
Comprehensive SWMMP Update began in 2010
SWMMP completed in 2012, proposing a Capital Improvement Plan with ~$200M of improvements
PROJECT BACKGROUND: CITY OF MIAMI BEACH STORMWATER PROGRAM
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
FUNDING September 2014 – City Commission
approved increase in stormwater fees to issue bonds to fund projects
Three separate bonds issued for a total of $300M
PROJECT BACKGROUND: CITY OF MIAMI BEACH STORMWATER PROGRAM
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
CIP Plan Newest Cost Estimate $400M-$500M 80 Pumps Elevating Roads Raising Seawalls
Miami Herald Article http://www.miamiherald.com/news/local/community/miami-dade/miami-beach/article41141856.html
PROJECT BACKGROUND: CITY OF MIAMI BEACH STORMWATER PROGRAM
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
PROJECT BACKGROUND: SEA LEVEL RISE Sea Level Rise King Tides
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
PROJECT BACKGROUND: SEA LEVEL RISE
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
PROJECT BACKGROUND: LOCATION
Location
Florida Miami-Dade County
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
Location
Florida Miami-Dade County
City of Miami Beach
PROJECT BACKGROUND: LOCATION
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
Location
Florida Miami-Dade County
City of Miami Beach Sunset Islands 3 & 4
PROJECT BACKGROUND: LOCATION
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
PROJECT BACKGROUND: DESIGN-BUILD PROCUREMENT
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: DESIGN CRITERIA PACKAGE
SCOPE OF WORK Rebuild Roadways
New 8” Water Main
Line Sanitary Sewer Mains and Laterals
Underground Overhead Power and Telecom
New Stormwater System with Pump Stations
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: DESIGN CHALLENGES Low Elevations
Min. 1.20 - 1.40 ft-NAVD Soil Conditions
Muck
Narrow Rights-of-Way 50’ R/W with several
encroachments
Island Surrounded by water One road in and out
Stakeholders Ongoing residential
constructionTHE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: OUR APPROACH
Minimal roadway elevation changes
No Black Base
Relocate Pump Station for Island 3
Construction Phasing to avoid conflicts
Minimizing Impacts to Encroachments
and Residents
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: ROADWAY ELEVATIONSDCP Criteria Roads < El. 3.50 ft-NAVD Black Base Roads > 3.50 ft-NAVD Limerock BaseCMA and Contractor Proposed Alternate to black base of a GeotextileA woven polypropylene monofilament geotextile was selected. Provides: Separation Filtration ReinforcementRoads Raised 6” by Owner request via Change Order
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: RESILIENCYInfrastructure Hardening Pump Stations
Backflow Preventers
Pavement Strengthening
Elevated Seawalls
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN
Design Parameters
Collection and Conveyance
Water Quality Treatment
Pump Station Design
Outfall Design
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN Design Parameters
5-year, 24-hour rainfall with 1.25 Safety Factor – 7.5”
Tailwater of 2.70 ft-NAVD (~ 30” higher than Mean High Water)
Maintain 8’ width of road dry
Provide Water Quality for R/W
Serve all R/W and full landlocked lots and half of waterfront lots for Water Quantity
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN Collection and Conveyance
Interconnected catch basins
Island 3: 16.9 acres
Island 4: 14.8 acres
Pipe sizes ranging from 18” to 72”
Yard drains provided for swales
Harmonization of Driveways
Custom Valley Gutters
Overflow structures utilize existing outfalls with backflow prevention
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN
Water Quality Treatment
Existing System – No Treatment
Designed to treat Right-of-Way
Hydrodynamic Vortex Units
Offline configuration with bypass
Trash Rack provided upstream
10-ft Downstream Defenders for
each Island, treating approx. 13 cfs
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN
Pump Station
Components
Trash Rack/Bypass
Wet Well
Duplex Pumps
Stormwater Force Main
Energy Dissipater
Control Panel
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN Pump Station – By the Numbers
Item PS#3 PS#4
Design Flow 23,177 gpm 17,830 gpm
Motor 110 hp 90 hp
Motor Current 193A 112A
Force Main 30” 24”
Pump Tube 48” 32”
Access Hatch 84”x156” 72”x125”
Wet Well (WxLxD) 14’x19’x15’ 9’x14’x15’
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN Pump Station
Control Panel
Variable Frequency
Drive (VFD)
Bottom of Panel set
at BFE + 2 feet
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: STORMWATER DESIGN
Outfall Design
Energy Dissipaters
Flap Gates
Manatee Grates
Max. Discharge Velocity
of 1.75 ft/s
Rip-Rap and Seagrass
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: PERMITTING SFWMD
Army Corps of Engineers
Miami-Dade RER-DERM
Water Control
Outfalls
Dewatering
Coastal Resources
Urban Forestry
Miami-Dade County Traffic
Health Department
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: LESSONS LEARNED
These Pumps are Huge
Check and double check dimensions for pumps, flanges, hatches, etc.
Overhead clearance for cofferdams
Electrical Equipment
Outfall permitting is critical
Document, document, document!
Design-Build is sometimes Build-Design
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
SUNSET ISLANDS 3 & 4: FUTURE CONSIDERATIONS
Miami Beach now
requiring minimum crown
of road of 3.70 ft-NAVD
Now designing for 10-
year, 24-hour storm
Site considerations for
generator
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
QUESTIONS?
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
THANK YOU!
THE FRONT LINES OF SEA LEVEL RISE: A RESILIENT DESIGNFSA WINTER CONFERENCE 2017
