. Electric traction and transmission engineering . DEFLECTING WALL. SPILLWAY 530 FT. SLUICE CATL3 Fig. 120. capacity or pondage of about 350 million cubic feet. shows the power house and sluice-gate masonry of thisdevelopment, looking upstream. The power furnished by a given stream may be increasedby a suitable reservoir, for the water impounded during therainy seasons may be partially drawn off during time of lowwater. The water available for pondage is limited, how-ever, since the level of head water can only be lowered acomparatively small amount without impairing the outputand effi
. Electric traction and transmission engineering . DEFLECTING WALL. SPILLWAY 530 FT. SLUICE CATL3 Fig. 120. capacity or pondage of about 350 million cubic feet. shows the power house and sluice-gate masonry of thisdevelopment, looking upstream. The power furnished by a given stream may be increasedby a suitable reservoir, for the water impounded during therainy seasons may be partially drawn off during time of lowwater. The water available for pondage is limited, how-ever, since the level of head water can only be lowered acomparatively small amount without impairing the outputand efficiency of the plant. Water is led from the head-race or the reservoir through 290 TRACTION AND TRANSMISSION. suitable hand- or motor-operated head gates to the forebayand from there to the wheel pits. The water in enteringthe wheel pit from the head-race usually passes through atrash rack consisting of narrow iron bars, the function ofwhich is to prevent large floating objects from entering theturbines. Open wheel pits are usual for heads up to 30feetj whereas cl
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