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Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

5-70

However, during high flow rates (>2800 cfs), when the reservoir is used to

provide storage of Lake Okeechobee water, the selected alternative performs

slightly better than the 2050B3 (69 events compared to 83 events, respectively).

However, none of these alternatives are significantly different from the others.

5.6.4 Ridge and Slough and Tree Island NAI Performance

Ridge and slough and tree island ouputs were not calculated for the next-added

increment model run due to difficulties of modeling rain-driven operational

triggers in the Everglades. Initial model runs indicate that the rain-driven

triggers sometimes cause additional water to be imported into the WCAs at

times when modeled water levels are already high to ensure that stage recession

in those areas follows NSM-like patterns. However, the performance measures

used to calculate ridge and slough and tree island habitat units would score such

effects negatively. Therefore, it was determined to take a conservative

analytical approach and not quantify next-added incremental habitat unit

outputs for these indicators for this revised draft PIR/EIS. Instead, the

operating plan calls for releasing the water stored in the reservoir when stages

in the WCAs indicate that additional water should be provided to those areas

based on monitoring and adaptive management principles.

5.7 JUSTIFICATION OF THE TENTATIVELY SELECTED PLAN (TSP) ON

A NEXT-ADDED INCREMENT (NAI) BASIS

Section 385.9 ("Implementation Principles") of the CERP Programmatic

Regulations required that "individual projects shall be formulated, evaluated,

and justified based on their ability to contribute to the goals and objectives of the

Plan and on their ability to provide benefits that justify costs on a next-added

increment basis." The EAA Storage Reservoirs project's contribution to the goals

and objectives of the CERP were evaluated by quantifying the increase in

environmental benefits (habitat units) in Lake Okeechobee, the Caloosahatchee

and St. Lucie Estuaries, and the ridge and slough and tree island communities

in the Water Conservation Areas with all of the rest of the CERP compared to

future without-project conditions. As expected, although the with-project next-

added incremental performance was improved for Lake Okeechobee and the

estuaries, the magnitude of the improvement was not as great as that calculated

for the system formulation.

One simple additional measure of next-added incremental justification is the

relative cost-effectiveness of above-ground storage in the CERP capable to store

regulatory releases from Lake Okeechobee and act as a source of additional

environmental water supply to the WCAs and Everglades National Park. The

EAA Storage Reservoirs project (360,000 ac. ft. of storage capacity) will provide

approximately one-fifth of all of the above-ground storage capacity included in

the CERP (1,543,270 ac. ft.), and a large fraction of the total storage capacity in

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