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Section 6 The Selected Alternative Plan

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

6-29

be isolated and the discharge area dewatered for access for maintenance and

repairs.

Backflow gates will be installed at the discharge tube of each large pump. The

gates will be twin vertical-lift roller gates in a bulkhead configuration with relief

flaps located at the siphon discharge terminus as shown on Plate M-7. Primary

functions of the gates are to protect against backflow during pump shut-down

and non-pumping periods when the discharge pool is above the invert (summit),

and to prevent possibility of reverse siphoning due to incomplete breaking of

prime during shut-down of pumps. Each gate will be raised and lowered by a

single screw-stem with a Limitorque-type electric motor operator controlled from

within the station.

6.4.3.2.9 Gated Culverts

The gated culverts will use a slide type gate mechanism, which, because of the

head requirement, will need to be constructed of stainless steel. If increased

water-tightness is desired, resilient rubber seals will be part of the design.

The culvert gate will be a commercially available self-contained stainless steel

gate unit similar to those manufactured by Waterman Industries, Inc., and

Hydro Gate Corporation. The gate will be designed to meet American Water

Works Association leakage requirements for sluice gates. An electric operator

will operate the rising stem of design suitable for attaching to a concrete

bulkhead. The electric operator will include, but not be limited to, the motor,

actuator unit gearing, limit switch gearing, position limit switches, torque

switches, stem nut, declutch lever, high precision gate position potentiometer,

and hand wheel as a self-contained unit. The actuator will have sufficient

capacity to raise or lower the gate at a speed of 6-inch/min against the operating

heads. The hand wheel will operate in the clockwise direction to close. External

declutch lever will be padlockable in either the manual (hand wheel) or motor

mode.

6.4.3.2.10 Generator

Each gated culvert will have an emergency backup generator fueled with liquid

petroleum gas (LPG), located in a control room. A generator is required because

of the need to assure gated culvert operation during commercial power outages.

An underground LPG tank with sufficient capacity to assure operation of the

culvert gates for at least 7 days will be used.

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