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DESIGN SUMMARY <br /> A gated 24-inch diameter outlet pipe (Ref. Sheet 2) will provide the principle means <br /> for regulating the reservoir pool. To install the outlet conduit, the existing embankment will <br /> be breached by excavating an open trench to elevation 10,680 feet, 45 feet below the <br /> dam crest. The reservoir level below elevation 10,684 feet will be considered dead storage <br /> and will probably not be released downstream, except during drought years or other <br /> unusual conditions by pumping. The outlet has been sized to discharge at a rate of 24.5 <br /> cfs with 10 feet of head. The estimated average annual peak inflow to the reservoir is less <br /> than 10 cfs. Outlet discharge calculations are presented in a subsequent section of this <br /> report. The outlet conduit will be 24-inch, Class 5, reinforced concrete pipe placed upon <br /> a reinforced concrete cradle. A 15" x 15" sluice gate with a handwheel and 1 %s-inch <br /> encased stem will be used for regulation of the reservoir discharge. The sluice gate will <br /> be located on the upstream end of the outlet pipe. <br /> The existing emergency spillway is located at the south abutment of the dam. The <br /> spillway is a 20-foot wide, open channel design with a concrete control section at elevation <br /> 10,717.5 feet, providing 7.5 feet of emergency freeboard. The spillway has a discharge <br /> capacity of 1,240 cfs at the dam crest and is capable of safely passing the probable <br /> maximum flood. Because the spillway is adequate for the water storage reservoir, no <br /> improvements are proposed for the existing structure. <br /> The existing dam is about 135 feet high, as measured from the dam crest to the <br /> original ground surface. The dam crest is at elevation 10,725 feet. Tailings occupy <br /> approximately 650 acre-feet of space, with the top of the tailing material at an elevation <br /> of approximately 10,660 feet. Removal of all tailing material will restore the reservoir to <br /> the original capacity of about 3,000 acre-feet. Climax has filed an application for an <br /> absolute water right of 400 acre-feet and a conditional water right of 5,300 acre-feet. <br /> Future enlargement of the dam and reservoir is considered a possibility. The outlet works <br /> proposed here are considered incompatible with significant dam heightening. <br /> 3 <br />