1.4 l 8 feb and c51 reservoir
TRANSCRIPT
ASCE – Tri‐County WorkshopL‐8 Flow Equalization Basin
and C‐51 ReservoirMay 10, 2013
Tommy Strowd, PESFWMD Assistant Executive Director
Restoration Strategies Key Projects
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Existing
Northwestern Palm Beach County
Former 950‐acre rock mine
46,000 ac/ft of storage
Capture and store excess surface water from L‐8 basin
Benefit South Florida’s ecosystem and sustain regional water supplies
L‐ 8 Reservoir
L‐ 8 Canal
J WCorbett Wildlife Management Area
Water Catchment
Area
Loxahatchee Slough
Arthur R. MarshallLoxahatchee
National Wildlife Refuge
WellingtonWellington
Fox TrailFox Trail Royal Palm Beach
Royal Palm Beach
Palm Beach International
Airport
Palm Beach International
Airport
Lake WorthLake Worth
GreenacresGreenacres
Rivera BeachRivera Beach
North Palm Beach
North Palm Beach
West Palm Beach
West Palm Beach
Palm Beach Gardens
Palm Beach Gardens
Southern BlvdSouthern BlvdTu
rnpike
Turnpike
95
95
95
Turnpike
Turnpike
Existing
Northwestern Palm Beach County
Former 950‐acre rock mine
46,000 ac/ft of storage
Benefit South Florida’s ecosystem
Essential Feature in the District’s Restoration Strategies for WQ in the Everglades
Assist in sustaining regional water supplies
L‐8 ReservoirL‐8 Reservoir
L‐8 Reservoir
Arthur R. MarshallLoxahatchee
National Wildlife Refuge
Existing
Northwestern Palm Beach County
Former 950‐acre rock mine
46,000 ac/ft of storage
Capture and store excess surface water from L‐8 basin
Benefit South Florida’s ecosystem and sustain regional water supplies
L‐ 8 Reservoir
L‐ 8 Canal
J WCorbett Wildlife Management Area
Water Catchment
Area
Loxahatchee Slough
Arthur R. MarshallLoxahatchee
National Wildlife Refuge
WellingtonWellington
Fox TrailFox Trail Royal Palm Beach
Royal Palm Beach
Palm Beach International
Airport
Palm Beach International
Airport
Lake WorthLake Worth
GreenacresGreenacres
Rivera BeachRivera Beach
North Palm Beach
North Palm Beach
West Palm Beach
West Palm Beach
Palm Beach Gardens
Palm Beach Gardens
Southern BlvdSouthern BlvdTu
rnpike
Turnpike
95
95
95
Turnpike
Turnpike
Existing L-8 ReservoirExisting L-8 Reservoir
Proposed C‐51 ReservoirProposed C‐51 Reservoir
Proposed
Located in western Palm Beach County
75,000 ac/ft of storage
Capture and store excess surface water from C‐51 basin
Increased water storage and delivery to help benefit South Florida’s regional water supplies
Reduce harmful discharges to the Lake Worth LagoonLake Worth
LagoonLake Worth
Lagoon
C‐51 Reservoir
L‐8/Northern ITID Basin
LakeOkeechobee
C‐51 West Basin
Source of Water
L‐8 Flow Equalization Basin (FEB)
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L‐8 Flow Equalization Basin (FEB)
• Component of the Eastern Flow Path– Storage initially acquired in 2003
• 950 acres, Excavated to ‐42 feet NAVD, 45,000 acre feet capacity
– Divided into 6 cells– Adjacent to and west of the L‐8 Canal
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L‐8 Flow Equalization Basin (FEB)
• Component Purpose– Part of Eastern Flow Path
• Attenuates peak flows from S‐5A and C‐51W basins
• Reduces impact of storm event inflows and optimizes STA inflow rates
• Works in conjunction with other Eastern Flow Path Projects
– L‐8 Divide Structure, STA 1W Expansion, S‐375 Structure, S‐5A South Divide Structure
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L‐8 Flow Equalization Basin (FEB)Unique Geology
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L‐8 Flow Equalization Basin (FEB)Project Description
• Design and Construct Infrastructure to Utilize Existing Storage– 450 cfs outflow pump station– 3,000 cfs inflow structure– Embankment revetment – Soil Cement– Reservoir Improvements – Cell‐to‐cell cuts
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• Executed Design/Build Contract in September 2012– Archer Western/Jacobs Engineering– $64 M– Construction complete
• 18‐April‐2015
– Testing and Commissioning Complete• 15‐Oct‐2015
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L‐8 Flow Equalization Basin (FEB)Project Overview
L‐8 Flow Equalization Basin (FEB)Project Overview
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L‐8 FEBPump Station
L‐8 FEBPump Station
L‐8 Flow Equalization Basin (FEB)Soil Cement Revetment
TOB 23’ NAVDTies intoexisting
rock shelf~ 3‐5’ NAVD
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L‐8 Flow Equalization Basin (FEB)Dewatering Operations
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C‐51 Reservoir Proposed Project
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C‐51 ReservoirFuture Water Supplies
• Lower East Coast Water Supply Plan under way– Targeted for
completion 2013
• Water sources capped– Regional Water
Availability Rule approved 2007
• Feasibility Study focus– Modeling of storage
capability– Quantity of water lost
to tide– Ability to move water
through canal system to create head
C‐51 Reservoir Sub‐Regional Geology
C‐51 ReservoirC‐51 Discharges to Lake Worth Lagoon
C‐51 ReservoirSaltwater Intrusion
C‐51 ReservoirC‐51 Canal Conveyance Capacity
• Challenges for western PBC communities
C‐51 Reservoir Conveyance
Reports have shown that it is feasible to use a combination of District & Lake Worth Drainage District facilities
C‐51 ReservoirSummary of Benefits
• Regionally significant project with multiple public purposes• Beneficial use of water lost to tide
• Decrease in harmful fresh water releases to Lake Worth Lagoon
• Long‐term & cost‐effective Alternative Water Supply
• Potential flood relief for western Palm Beach County
• Sea level rise & saltwater intrusion benefits
• Location and geology• Cross roads• Extensive canal infrastructure &
conveyance capabilities• Stakeholder interest and support
C‐51 Reservoir SFWMD Considerations
Construction: cost, schedule, performance, technology, completion and delivery
Operations and Maintenance: cost and performance (fee)
Renewal, replacement and life cycle costs
Supply of water
Contracts for water storage/market alternatives
Financing/Credit Rating
Regulatory
C‐51 ReservoirDistrict Infrastructure Connections Could Substantially Reduce Project Costs for Utilities
Phase 1 costs with independentInfrastructure $186.5 million
Phase 1 costs with connectionto L‐8 Reservoir $150.5 million
Questions