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Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

5-68

5.6 PERFORMANCE OF THE NEXT ADDED INCREMENT (NAI)

The programmatic regulations require evaluation of the tentatively selected plan

as the “next-added increment.” The next-added increment analysis evaluates the

effects, or outputs, of the tentatively selected plan as the next project to be added

to the group of already approved CERP projects. This analysis helps illuminate

the amount of benefits the selected alternative plan contributes without regard

to future CERP projects. It also helps to ascertain whether sufficient benefits

would accrue to the selected alternative plan to justify the cost, if no additional

CERP projects (other than those already existing or authorized) were

implemented.

The next added increment analysis used model runs provided by the Interagency

Modeling Center designed specifically for evaluation of the NAI using the start-

up operating plan. Details on the performance measures, evaluation

methodology, and quality index scores used to determine the habitat units (HU)

for each region is described in Appendix C. A discussion of the results follows.

5.6.1 Lake Okeechobee NAI Performance

The NAI model run (NAI-S5A) based on the start-up operating plan

demonstrates the project would produce additional 14,601 AAHUs for Lake

Okeechobee compared to 2050 future-without-project (Table 5-24). In addition,

backpumping values into Lake Okeechobee would be less, reducing loading from

canals containing primarily agricultural run-off (Table 5-25). The project

reduces backpumping by a total volume (over 36 years) of 100,000 acre-feet.

TABLE 5-24: HABITAT UNITS FOR LAKE OKEECHOBEE HIGH WATER

PERFORMANCE MEASURES (PMS) (LO-E3 AND LO-E10 SA) FOR THE FIVE

WETTEST YEARS FROM THE MODELING PERIOD OF RECORD.

2000B3 2050B3 NAIS5a

HUs using high water PMs, wettest years 41760 42004 56605

TABLE 5-25: VOLUME OF BACKPUMPING IN ACRE-FEET FROM THE

EVERGLADES AGRICULTURAL AREA INTO LAKE OKEECHOBEE THROUGH

THE S-2 AND S-3 PUMP STRUCTURES FOR EAASR PROJECT ALTERNATIVES.

2050B3 NAIS5a

S2 total ac-ft 334,497 240,456

S3 total ac-ft 87,484 81,328

Total Volume ac-ft 421,981 321,784

1 2 ... 217 218 219 220 221 222 223 224 225 226 227 ... 385 386

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