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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 /> <br />I. REVIEW OF THE ELKHEAD CREEK DAM AND RESERVOIR PROPOSED BY COLORADO <br /> <br />DIVISION OF WILDLIFE <br /> <br /> <br />The most important criteria established in the original design which <br /> <br /> <br />would have a definite bearing on the enlarged reservoir are discussed <br /> <br /> <br />as follows: <br /> <br />1. Expected Life on the Project. The estimate indicated that it <br />would take the sediment forty-one (41) years to fill the presently <br />planned reservoir up to the spillway crest elevation of 6340.5 feet. <br />The life of an enlarged reservoir will definitely be prolonged due <br />to additional storage capacity. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />2. Type and Design of the Dam. A homogeneous earthfill dam with a 2\ <br /> <br /> <br />to 1 upstream slope and a 2 to 1 downstream slope were used for the <br /> <br /> <br />original design. The factor of safety of the dam against sliding <br />under the most severe earthquake condition was calculated as 1.2. <br /> <br />It is believed that the same type of earth embankment can be satis- <br /> <br />factorily constructed for a higher dam; however, in the final design <br /> <br />for an enlarged dam, a detailed slope stability analysis should be <br />done for a final dam section. <br /> <br />3. Spillway Capacity. A probable maximum flood of 15,900 cubic feet <br />per second was derived and used for the project which is considered <br /> <br />conservative and is applicable to an enlarged reservoir with no <br /> <br />modifica tion. <br /> <br />4. Outlet Work Capacity. Adequate for additional downs team requirement. <br /> <br />1 <br />