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<br />Creek Reservoir would be limited to blocking the existing spill- <br />way to prevent floodwaters from entering the Sand Creek basin. <br />The crest of the spillway would be raised to elevation 5629 <br />feet by constructing an impervious embankment across the exist- <br />ing spillway channel. <br /> <br />d. Cherry Creek channel improvement. In formulating the <br />scale of development for the Cherry Creek channel improvement, <br />the need for safeguarding the reservoir operational capabilities <br />was given primary consideration. Effective operation of both <br />Castlevood and Cherry Creek Reservoirs depends upon being able <br />to continue operational releases over the lives of the projects. <br /> <br />e. To assure that the planned maximum operational releases <br />can be made, it is necessary to acquire sufficient interest in <br />the channels downstream from the dams to preclude encroachment <br />therein. In addition, it is necessary to construct sufficient <br />stabilization measures within the Cherry Creek channel down- <br />stream from the Cherry Creek Dam to prevent planned reservoir <br />releases or natural tributary flows from causing erosion or <br />other damages. Such damage would inhibit the capac1 ty of the <br />Cherry Creek channel to carry the reservoir releases or could <br />result in legal efforts to restrict project operations. With <br />Cherry Creek and Castlevood Reservoirs in operation, a residual <br />flood hazard still exists due to uncontrolled inflow originating <br />downstream from the Cherry Creek Dam. Reduction of this residual <br />threat is desirable. These ends can best be met by providing a <br />stabilized channel downstream from the Cherry Creek Dam and by <br />providing a floodway downstream from the Castlevood Dam. The <br />stabilized channel would use the existing channel alignment and <br />configuration, and the floodway would be provided by acquiring <br />about 1,000 acres of land in and along the Cherry Creek channel. <br /> <br />f. An analysis was made to determine the most appropriate <br />design discharge for the Cherry Creek channel downstream from <br />the dam. Four discharges, ranging in magnitude from a minimum <br />of 5,000 cubic feet per second, the largest reservoir release, <br />to a maximum discharge equivalent to the standard project flood- <br />flow, were analyzed as possible designs for the channel improve- <br />ments. The results of this analysis indicated that, when all <br />factors are considered, a channel which would provide standard <br />project flood protection to the extensively developed areas <br />along Cherry Creek is warranted. <br /> <br />33 <br />