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<br /> <br />. <br /> <br />f. Detailed briefs of the public hearings and meetings: are ' <br />presented in appendix XII. <br /> <br />14. PROBLEM ANALYSIS <br /> <br />Because of the hydrologic inter-relationships between the <br />Cherry Creek and Sand Creek basins, caused by ,the existence of <br />the Cherry Creek emergency spillway. problem analysis was <br />initially focused on Cherry Creek Reservoir and the Cherry Creek <br />basin. Section II of this report presents the problems and <br />solutions associated with the Cherry Creek basin. Sand and <br />Toll Gate Creeks are discussed in Section III. Problems and <br />potential solutions associated with Westerly Creek, a left-bank <br />tributary of Sand Creek, are essentially limited to the Westerly <br />Creek drainage area and are the subject of a separate report. <br /> <br />II . CHERRY CREEK BASIN <br /> <br />15. PROBLEMSCONSIDERED <br /> <br />a. Flood problem. <br /> <br />(1) Cherry CreekD8lII and Reservoir. A remote but <br />poten~ially severe flood threat exists along Toll Gate and Sand <br />Creeks from discharges through the Cherry. Creek Reservoir <br />emergency spillw~. If a spillw~ deSign flood were to occur <br />with the flood control pool in the Cherry Creek Reservoir at <br />its maximum level, a peak discharge of 45,000 cubic feet per <br />second ltould be diverted into the Sand Creek basin. DllIIIages <br />of at least $7.8 million and $83.4 million under existing and <br />future conditions of development, respectively, would occur <br />along Toll Gate and Sand Creeks. Wind_wave action, which could <br />be reasonably expected to occur, would cause overtopping of the <br />Cherry Creek Dam causing additional damages along Cherry Creek. <br /> <br />(2) If the flood control pool were half-full when a <br />spillw~ design flood occurred, a maximum peak discharge of <br />30,000 cubic feet per second would be diverted into the Sand <br />Creek basin. D8lIIages of at least $5.5 million and $58.8 million <br />under existing and: future conditions of development . respectively, <br />would. occur along Toll Gate and Sand Creeks. <br /> <br />(3) Diversion of Cherry Creek water into the Sand Creek <br />basin is possible with various combinations of antecedent pool <br />levels and flood inflows. For eX8lllple, any combination of . <br />successive floods having a total volume in excess of 107 percent <br /> <br />"R" Jan 72 <br /> <br />20 <br /> <br />. <br />