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<br />the high cost and the remote probability of use associated with <br />providing reregulation storage in a reservoir on Toll Gate Creek, <br />interbasin storage is not a preferable method of solving the <br />Cherry Creek problem. Of the four plans considered for intra- <br />basin storage, only the plan which incorporates supplemental <br />storage in the authorized Castlewood Reservoir would resolve the <br />hydrologic deficiency problems in the Cherry Creek Reservoir <br />without creating undue political, social, and environmental <br />problems. In addition to effectively reducing the hazards at <br />the existing project, the supplemental storage plan is the only <br />plan which would generate additional tangible flood control and <br />recreation benefits. The Castlewood Dam and Reservoir project <br />would also be the most efficient meanB of resolving the flood <br />and erosion problems along Cherry Creek between Franktovn and <br />the existing reservoir, and would provide an excellent oppor- <br />tunity to satisfy a portion of the area's recreation needs. A <br />channel improvement project, utilizing existing structures and <br />rights-of-way, would be the most effective and economically <br />efficient solution to resolve the flood problems and hazards <br />along Cherry Creek downstream from the dam. Also, improvement <br />of this reach of the Cherry Creek channel would insure opera- <br />tional capability of the existing project. The best solution <br />to the water resources problems and needs in the Cherry Creek <br />basin is a plan which would include constructing the Castlewood <br />Reservoir project, raising the Cherry Creek spillway crest, and <br />improving the Cherry Creek channel. <br /> <br />17. PROJECT FORMULATION <br /> <br />a. General. The plan of improvement for the Cherry Creek <br />basin vhich was selected for further study consists of three <br />basic elements. These elements are the authorized Castlewood <br />Dam and Reservoir project, the existing Cherry Creek Dam and <br />Reservoir project, and the Cherry Creek channel improvement <br />downstream from the existing dam. Because of the tandem arrange- <br />ment of these elements, there are hydrological interrelationships <br />which make it necessary to consider the elements as an integral <br />unit. Studies were undertaken, however, of each plan element <br />to determine its specific scale of development. Because of <br />the possible consequences associated with the hydrologic defi- <br />ciencies of the Cherry Creek Reservoir, the "do-nothing" option <br />was not considered. Protection against the standard project <br />flood vas adopted as the minimum standard for the Cherry Creek <br />project. <br /> <br />31 <br />