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<br />002581 <br /> <br />(1612 m). Recreation and flood control benefits would be the same as <br />Alternative A. <br /> <br />2,3,1.3 A larger dam at Taylor Draw would require approximately 5800 <br />feet (1763 m) of road relocation assuming the road could be located In <br />the same area as Alternative A. This would include approximately 2100 <br />feet (638 m) above the Staley Gordon Mine Bridge. The dam would also <br />require the relocation of a portion of 10-inch (25 em) gas pipeline, <br />powerllne, and telephone line above the high water line. Additional <br />information on a larger dam is found on Figure 2 - 1. <br /> <br />2,3,2 Construction Methods, Features and Schedule <br /> <br />2.3,2.1 Dam Design - The dam would be a zoned earthfill dam <br />containing approximately 423,000 cubic yards (323,405m3) of material. <br />The cutoff trench would extend Into bedrock for the length of the dam. <br />The out let works, road relocat Ion and ut i lit les relocat ion would be <br />similar to Alternative A except longer. The upstream face would have <br />a 3:1 slope (i.e. 3 horizontal to 1 vertical) and the downstream face <br />would have a 2:1 slope. The construction schedule is shown on Figure <br />2 - 3. <br /> <br />2.3,2.2 Spillway Design - For comparison purposes It is assumed that <br />the spillway capacity would remain at 65,300 cfs (l849m3/s) for all <br />Alternatives, The larger storage capacity has not been evaluated in <br />light of public safety and it is possible that a larger spillway would <br />be required for a larger reservoir. Due to the height of the dam, <br />Reinforced Earth(r) walls would not be used to fonm part of the dam. <br />Therefore, the spillway would consist of an over-the-crest concrete <br />chute the full length of the downstream face, with a roller bucket at <br />the base of the dam to be used to cont ro 1 the d i ss i pat i on. The <br />spillway would be 504 feet (154m) long and contain approximately 7000 <br />cubic yards (5352m3) of concrete, The difference in elevation between <br />the spillway crest and the top of the dam would be la-feet (3m). The <br />spillway would be ungated for the length of the crest, <br /> <br />19 <br /> <br />,i; ~- ~, <br />