1.4 l 8 feb and c51 reservoir

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


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




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



Existing




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



WellingtonWellington

Fox TrailFox Trail Royal Palm Beach

Royal Palm Beach


Airport


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


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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• 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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• 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

Documents

1.4 l 8 feb and c51 reservoir