Reservoir Construction Case: Tampa Bay Regional Reservoir

By Franz Campero, PhD, PE, MBA

PascoCo.

New PortRichey

HillsboroughCo.

PinellasCo.

Tampa

St Petersburg

•2 Million Residents Served•250 mgd Average Daily Demand

Project Background

Enhanced Surface Water System

• Three sources – Alafia River, Tampa Bypass Canal & Hillsborough River (197 mgd pumping capacity)

• One treatment plant (66 mgd capacity)

• One storage element (15 billion gallons)

Project Background

Enhanced Surface Water

System

Project Background

Enhanced Surface Water System

Hillsborough River

Tampa Bypass Canal

Alafia River

Treatment Plant

Pump Station

To Regional System

Reservoir

Pump Station

Project Background

Tampa Bypass Canal Pump Station

• Hillsborough River High Water– Minimum 65 mgd over Tampa Dam

– Withdrawals increased from 10% to 30% of total flow

• Tampa Bypass Canal

– Minimum 7 mgd over

downstream structure– Withdrawals of 80%

of total flow

• Total Design Capacity –

– 145 mgd

Project Background - Components

Alafia River Pump Station

Alafia River– Minimum 80 mgd Flow in

River– Withdrawals of 10% of total

flow, up to 52 mgd

Project Background - Components

Tampa Bay Regional Water Treatment Plant

• Capacity 66 mgd • Water Sources

– Alafia River– Hillsborough River– Tampa Bypass

Canal• Constructed through

a DBO process

Project Background - Components

The Reservoir

Tampa Bay Regional Reservoir Project

• November 1998 -Start of Design Activities

• May 2002 -GroundbreakingCeremony

• June 2002 - Started Construction

• March 2005 - Construction Completed

Reservoir Site and Pipeline RouteThe Reservoir

• Earthen Structure – 1,000 acres– 15 billion gallons

• Total Project Site– 5,229 acres

• Connecting Pipeline– 42,000 feet of

84-inch diameter• Wetland Mitigation

– 450 acres• Upland Preservation

– 600 acres

The Reservoir

The Reservoir: Property Boundaries & Mitigation Areas

• Hillsborough County Department of Health Permits – Local

• EPCHC Wetland Authorization – Local• FDEP Environmental Resource Permit - State• SWFWMD Water Use Permit - State• Environmental Impact Statement R.O.D. -

Federal• USACOE 404 Dredge and Fill Permit - Federal

The Reservoir: Major Permits

Site During Phosphate Mining Operations 1957

Site Conditions Prior To Construction

Construction ProgressOctober, 2002

Construction ProgressNovember, 2002

Construction ProgressDecember, 2002

Construction ProgressJanuary, 2003

Construction ProgressFebruary, 2003

Construction ProgressMarch, 2003

Construction ProgressDecember, 2002

Completed Project March, 2005

The Reservoir: Elements of Embankment Design

Reservoir Embankment•Up to 65 ft High•12,000,000 cy•45,000 cy/day

• ESRI ArcPad 6.0

• Data Collected with Laptops and WAAS Enabled GPS Units

• Data Downloaded Daily

• Merged into Database to Evaluate Data and Plot Using ArcMap 8.0

• Report Generator

• Spatial Evaluation Using 3-D Analysis

Collection/Management of Soil Test Data Using GIS/GPS

ArcPad 6.0• Types of Hardware

– Laptop Computer

– GPS Unit

– Personal Digital Assistant (PDA)

ArcPad 6.0 Customized Data Forms

Proctor Test Locations Through November 2002

Soil Density Test LocationsThrough November 2002

Blanket Drain Interior/ Toe Drain•250,000 CY Tailing Sand•54,000 LF Drain Pipe

12” Toe Drain

12” Interior Drain

Tailing Sand Blanket Drain

Soil-Bentonite Cut-Of Wall•25,500 LFT•890,000 SQFT•7,000 SQFT/DAY

Cutoff Wall: ProblemsCRACKS!!

Cutoff Wall: Solution

Waste Clay and Unsuitable Soils Removal•1,000,000 CY

Upstream Geomembrane Seepage Control System•4,000,000 SQFT•25,500 LFT Tie-In to SBCW

Geomembrane Problems

Soil-Cement Upstream Slope Erosion Protection•105,000 CY Stair-Step•260,000 CY Flat-Plate

Soil Cement Problems

CRACKS!!!

Soil Cement Problems

Questions?