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Section 5 Formulation of Alternative Plans

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

5-20

5.3.2.3 Wave Breaking Bench

A wave breaking bench is planned to be constructed along the inside face of the

exterior embankment (not the embankment which separates cell 1 and 2) for

either type of embankment construction. This wave-breaking bench will be

constructed to an elevation of 3 feet below the Maximum Surcharge Water Level.

The bench will be 25 feet wide on the top, with 1V on 3H side slope. The wave-

breaking bench will be constructed from limestone material.

5.3.2.4 Riprap Slope Protection

The interior face of the earthen reservoir embankment will be protected with a

24-inch thick layer of riprap revetment for erosion protection against wave

action and water level fluctuation. The material for this riprap will come from

blasting the cap-rock layer immediately below the superficial peat-silt layer

overlaying the EAA Study Area. In contrast to the embankment fill material, the

excavation of the seepage canal is expected to produce the required volume of

rock needed for the riprap revetment. The revetment will cover the entire

interior face of the embankment from top to bottom, including the wave-

breaking bench. A geotextile filter fabric will be placed under the riprap

revetment layer.

5.3.3 Pump Station Design

The new pump stations are reservoir inflow structures. The pump stations will

capture basin storm runoff, regulatory releases from Lake Okeechobee, and

backpump seepage intercepted in the reservoir seepage canals.

Pump sizes were based on flow data for the Miami and North New River Canals.

Maximum monthly average flows for the Miami and North New River Canals

were obtained from the SFWMD Model (2 x 2) CERP1 model run. Based on the

fact that Lake Okeechobee regulatory releases occur over an extended time

period, pump stations will have sufficient capacity to fill the reservoirs within a

period of 30 days or less. For the final PIR, pump station capacities will be

optimized using the sub-regional MIKE SHE model.

5.3.4 Culverts

A one design box culvert structure is considered the best for construction

efficiency, operation and maintenance activities, and economics of cost.

Therefore, an optimization process resulted in a 10 ft by 10 ft (height vs. width)

box culvert structure. The EAA Storage Reservoir design includes numerous

gated box culverts. Construction material for all culverts is to be reinforced

concrete.

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