Everglades Agricultural AreaStorage Reservoir A-1

30% Earthworks Design Phase

WRACApril 6, 2006

Shawn Waldeck, P.E.Acceler8 Project Manager

Project PurposeEAA Reservoir A-1 is an important part of the Comprehensive Everglades Restoration Plan (CERP). As part of CERP it will:

• Allow SFWMD to better manage water to the environment

• Allow SFWMD to manage water deliveries to agricultural community

A-1

• Capture, store, and make use of EAA Basin runoff and releases from Lake Okeechobee

• Reduce Lake Okeechobee regulatory releases to the estuaries

• Restoration of Everglades’ hydropatterns• Balancing inflow into STA-3/4• Preserve existing agricultural water uses• Ancillary improvement in flood protection in EAA

Project Purpose

Mia

mi C

anal

Mia

mi C

anal

STA-3/4STA-3/4

G-372G-372

G-370G-370

North

New

River C

anal

North

New

River C

anal

FutureFutureA-2A-2

ReservoirReservoir

ProposedProposed

A-1A-1ReservoirReservoir

Holey LandWildlife Management

Area

Holey LandWildlife Management

Area

Pump StationPump Station

Pump StationPump Station

Supply CanalSupply Canal

US H

ighw

ay 27

US H

ighw

ay 27

Overall Plan

STA-3/4 Supply Canal

EAA Reservoir A-1

NortheastPump Station

North NewRiver Canal

From G-372Pump Station

G-370Pump Station

Seepage Canal

Embankment

Internal Borrow Canal

G-383

Gate Structures

Connector Canal

Gate Structure

• 190,000 ac-ft of storage

• Seepage canals • New pump station

from North New River Canal

• Gated discharge structures

• STA-3/4 Supply Canal

Stripping berm

S T R I P P I N G

Borrow canal Seepage canal Cut-off wall

Advantages of Roller Compacted Concrete RCC

• Downstream slope maintenance generally not required if defect free.

• Risk of piping in dam eliminated.• Minor overtopping may be acceptable without damage.• Avoids the need to use moisture sensitive Fort Thompson

Formation material• Occupies less area than an embankment, so EAA Reservoir

A‑1 storage can be maximized.

Disadvantages of Roller Compacted Concrete RCC• Higher cost

• Supply risk because a large volume of cement must be imported.• Special foundation treatment required where caprock thin or absent• Predicting the magnitude of cracking and control of crack location with

certainty is difficult due to the variable foundation conditions. Seepage is expected to occur through cracks.

• Foundation preparation by air/water blasting• Settlement of the cutoff must be compatible with the rigidity of the RCC

structure.• Temperature control of the RCC components difficult in hot temperatures.• Moisture control in stockpiled aggregates difficult during wet season.• An RCC structure does not fit aesthetically with the surroundings. • Vertical upstream face creates a safety hazard; means for escape required

Design Safety

• Dam Design Criteria – DCM (Design Criteria Memorandum) coordination

• Superiority• Stability• Regular Inspections/Monitoring

Potential Recreational Opportunities

Project Assurance Requirements

WRDA (Water Resources Development Act) 2000 and Florida Statute requirements addressed:

• Identify water for the natural system• Identify water for other water-related needs• Confirm quantify water available to existing legal users has not been

diminished• Determine that existing levels of service for flood protection will not be

diminished outside geographic area of the project

Documentation of Project Assurances

• Documentation of Project Assurances for A8 Reservoir will be included in the Preliminary Design Documents (30% Design for both the earthworks and pump station phases)

• Acceler8 system wide benefits, ascribable to the EAA Project, will be identified in the Final Supplemental Environmental Impact Statement (SEIS)

• Corps Project Implementation Report (PIR) documents project assurances for Compartment A in its entirety

Surface Water Flood Protection

• Inherent flood protection due to reservoir• Additional capacity created in the existing canal system• Additional pumping station(s) in system

Seepage Controls

Permitting/Environmental

• 1502 Water Quality Certificate • USACE 404• 1501 Assurances• Environmental Site Assessment and Clean Up• Protected Species

– Manatee– Florida Panther– Wading Birds– Other

• Environmental Enhancements• Construction Permits• Air/Noise

Stakeholder Presentations

• Agricultural• Environmental• 298 Districts• Belle Glade• Pahokee• South Bay• Palm Beach County• Tribes• FPL/FDOT• Recreational• WRAC Issues Workshop• Full WRAC

Stakeholder Comments

• Safety• Flood Protection• Local Economic Development• Recreational Use(s)• Assurances• Consider other “less – engineered” alternatives• Wetland impact and mitigation• Holey Land seepage

S7

Degradation in the EAA

Sheetflow over the sawgrass plains to the EvergladesLake

Okeechobee

EAA

HISTORICAL

LakeOkeechobee

Loss of muck in the EAA through subsidence, compaction, and oxidation

PRESENT

Schedule for EAA Reservoir A-1

2005 2006 2007 2008 2009

Design

Construction

Cost Summary

Project Component

Direct Cost

(millions)

Construction Indirect Costs*

Project Reserve Indirect

Costs

Combined Cost

Embankment and EAA Reservoir A-1

$245.9 $89.0 $14.8 $349.7

Northeast Pump Station

$50.3 $16.8 $3.3 $70.4

Control Structures $10.4 $3.5 $0.7 $14.6

US 27 Bridges $3.8 $1.2 $0.3 $5.3

Totals $310.4 $110.5 $19.1 $440* includes sales tax, general requirements, overhead and profit, bonds, and insurance

Base Cost from Yellow BookEmbankmentPump StationControl StructuresU.S. 27 BridgesSubtotal StructuresTotal Yellow BookProrated to 190,000 AF

$M

437243.3

Costs adjusted to 2006A-1 (acres)Total A (acres)

36416,70030,000

Base Cost from BODR for EAA Reservoir A-1

EmbankmentPump StationControl StructuresU.S. 27 BridgesSubtotal StructuresTotal BODR

Costs adjusted to 2006

310.4 70.4 14.6 5.3

90.3 400.7

412.7

•Added cutoff wall

•Increase water depth to 12 feet

•Modified pump station and added pump station

Preliminary Design Report

Embankment Structures

Total PDR

Costs adjusted to 2006

349.7

90.3

440.0

440.0

•Added concrete to slurry wall

•Added mechanical mixing of slurry wall

•Embankment volume increased

Discussion