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<br />(2) The entrances are positioned so that migrating <br />fish in the main channel (left bank) can locate an entrance regardless of <br />the quantity and velocity of flow from the existing sluice gates. <br />However, fish searching for passage in other portions of the river may <br />have difficulty crossing the plume of flow from the gates to find the <br />entrances. <br />(3) This fishway does allow the two target species to <br />swim along the floor without obstructions. <br />b. Impacts. <br />(1) Impacts Affecting RWPC. <br />U <br />(a) To attain desirable fish attraction condi- <br />tions, RWPC may be asked to slightly modify their standard operating pro- <br />cedures. During high spring flows, releases of flow through the existing <br />sluice gates should be regulated for the best fish attraction conditions. <br />Flow from the sluice gates should not create a velocity barrier at the <br />collection channel entrances during the migration season. Also, as <br />flashboards are installed on the dam crest, their placement should start <br />at the right bank (looking downstream) and progress toward the left bank. <br />This should keep the attraction flow, created by spilling of water over <br />the crest, near the collection channel and fish ladder. <br />(b) RWPC may be asked to adjust the openings of <br />the gates for the best fish migration conditions. If the south gate was <br />fully open and the other three gates were partially closed, the fish <br />would migrate through the south gate. With this gate fully open, it <br />would have the lowest velocity and the least resistance for the fish to <br />swim against. Also, as fish exit the south gate, they would be less <br />likely to fall back over the spillway or through the sluice gates. <br />(c) The construction of this alternate will only <br />have minor impacts on RWPC operations. The structures and louver in the <br />power canal can be built or installed during the de-,-atering of the power <br />canal for maintenance. <br />(d) The location of the ladder will interfere <br />with RWPC access to the left bank during construction and may interfere <br />with their access during ladder operation. <br />33 <br />