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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />15:0 <br /> <br /> <br />diversion conduit would have its operating sill at the dead storage <br /> <br /> <br />pool elevation. The outlet works would include a guard valve, a <br /> <br /> <br />smaller diameter discharge pipe, and a control structure housing an <br /> <br /> <br />operating valve to regulate the outlet works discharge. <br /> <br />The design floods described in Section D.4.8 were routed through each <br /> <br /> <br />size of reservoir using a flood routing computer program to determine <br /> <br /> <br />the required size of spillway. Table D.ll lists the spillway <br /> <br /> <br />characteristics for both sizes of reservoirs. <br /> <br />TABLE D.ll <br />SPILLWAY CHARACTERISTICS <br /> <br /> Spillway Spi llway Peak Maximum <br />Reservoir Crest Crest Discharge Flood W.S. <br />Size Elevation Length-Ft. cfs Elevation <br />7,200 AF 6,046 150 37,710 6064.71 <br />4,400 AF 6,026 l50 37,766 6043.86 <br /> <br />The selected spillway design consists of a concrete ogee crest in an <br /> <br /> <br />open channel cut through the right abutment and discharging into <br /> <br /> <br />Whites Canyon. The discharge channel would be concrete lined and <br /> <br /> <br />hav~ a deflector bucket to reduce erosion of the canyon wall. <br /> <br />preliminary quantity estimates were made of the major work items <br /> <br /> <br />which would be required for construction of each size of dam and <br /> <br /> <br />reservoir. Darn embankment quantities were estimated by the <br /> <br /> <br />average-end area method for sections perpendicular to the dam axis on <br /> <br /> <br />20-foot centers. Spillway and outlet works excavations were <br /> <br />35 <br />