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Section 8 Plan Implementation

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

8-5

CERP activities) require revisions to the Project Operating Manual, those

revisions will be completed in accordance with the process outlined in the CERP

Programmatic Regulations and applicable USACE regulations, consistent with

applicable NEPA requirements.

8.4 PROJECT ASSURANCES

This project implementation report includes the identification of water for the

natural system and the identification of water for other water-related needs of

the south Florida region from the project. It also evaluates the project’s effects

on existing legal sources of water and effects on the level of service for flood

protection as required by WRDA 2000, and addresses related state assurances

requirements.

The hydrologic modeling, analytical procedures, and calculations performed for

these initial evaluations were generally based on the information contained and

the procedures developed for the draft programmatic guidance memoranda 3

(“Savings Clause Requirements”) and 4 (“Identifying Water Needed to Achieve

the Benefits of the Plan”). Because the guidance memoranda have not been

finalized, all of the data and information contained in this draft report are

considered to be preliminary and subject to change as a result of further

evaluations that may be performed to maintain consistency with the approved

final programmatic guidance memoranda. An explanation of the hydrologic

modeling, evaluation methods, and the results of these evaluations is included in

Annex G ("Legislative and Statutory Requirements") of this report

8.4.1 Level of Service for Flood Protection

The primary purpose of the Project is to store runoff from the EAA and

discharges from Lake Okeechobee to improve ecological functions in Lake

Okeechobee, the St. Lucie and Caloosahatchee Estuaries, and the EPA. The

storage of up to 360,000 acre-feet of water in an above ground reservoir operated

at a normal above ground pool depth of 12 feet will incidentally improve flood

protection by removing 32,000 acres from the drainage basin. A reservoir of this

size may be expected to increase average elevations of groundwater in adjacent

lands unless appropriate flood mitigation measures are included as part of the

TSP. Sub-regional hydrologic modeling conducted using the MODFLOW (a

three-dimensional groundwater flow model) and SEEP/W (a two-dimensional

finite element model) to determine the TSP’s effects on the level of service for

flood protection in effect as of December 2000.

An initial evaluation of potential project effects has been conducted for the

Project using the MODFLOW model. The results of the initial evaluation

indicate that the Project may increase groundwater elevations in portions of STA

3/4 adjacent to the Project and in a small area of the Holey Land WMA. A slight

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