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<br />c~~:~~~:7 <br /> <br />. <br /> <br />storage of the spring runoff in Idylwilde Reservoir for power <br />regulation would coincide, to some extent, with the unit's storage <br />of the presently unappropriated nows, municipal supplies, and <br />plains reservoir transfer. Since a large portion of the water <br />stored in Idylwilde would normally be appropriated for other uses, <br />Grey Mountain Reservoir releases would replace the water which is <br />stored out of priority in Idylwilde. <br /> <br />Minimum storage levels are proposed in each of the project <br />reservoirs for the combined purposes of providing space for sediment <br />encroachment, furnishing additional power head, and providing <br />minimum poo1.s for fishery and recreation. <br /> <br />. <br /> <br />Idylwilde Reservoir <br /> <br />Idylwilde Reservoir would have an active capacity of 169,000 <br />acre-feet and an inactive capacity of ll,OOO acre-feet. The top of <br />active conservation water surface elevation would be 7,860 feet and <br />the top of the inactive storage would be elevation 1',695 feet. The <br />water surface areas at these elevations would be 1,700 and 330 acres <br />respectively. An earth and rock-fill dam with a crest length of <br />about 1,250 feet and a height above stream bed of about 290 feet <br />would be required. A dike containing a spLllway structure with a <br />capacity of 27,000 cfs would be located in a saddle to the right of <br />the dam. The spillway channel be1.ow the structure would be unlined. <br />State Highway No. 1.4 and the existing power line would be relocated <br />to the north of the reservoir. The state Fish Hatchery would also <br />. - - - - be- rel<>cated-if_ a_suitable. B1t~_:1,.S_ ~"!l~ ~R!>le; otherwise, the state <br />would be reimbursed for the 1.0ss. - - <br /> <br />Idylwilde Powerpl.ant <br /> <br />Releases from Idylwilde Reservoir would be made through. a <br />peaking pOlrerplant located about one-fourth mile downstream from <br />the toe of the dam. The downstream location and the excavation <br />made for the taiJ..ra.ce would furnish additional head for the power- <br />plant. The powerplant would consist of two units having a total <br />capacity of 24,000 l<W. The average head would be 278 feet and the <br />maximum now would be 1,250 cfs. Annual. generation would be <br />39,70D,OOO kilowatt-hours of salable energy. The plant factor on <br />an annual. basis would be 20.4 percent and on a 5-l!2-day per week <br />basis 26 percent. Operation of this plant would be by remote <br />control from the Cache JA Poudr" P<JWerplant which woulD. be located. <br />fUJ:'ther downs ",'elUll. <br /> <br />. <br /> <br />5 <br />