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<br />V-8 <br /> <br /> <br />provides minimal benefits by itself, benefits were not separately <br />computed. <br /> <br />Dry Creek. An examination of topographic mapping indicates <br />that there is a pos sibility that it would be feasible to develop <br />a channel to divert a portion of the South Boulder Creek flows <br />around the southeast side of Baseline Reservoir into Dry Creek. <br />Dry Creek passes through an agricultural area and little exist- <br />ing development would be significantly affected by increased <br />flows. The legal aspects of this alternative are explained in <br />Appendix II. <br /> <br />With this alternative, a diversion structure would be constructed <br />which would operate only after the flows reached a predetermined <br />flood stage in South Boulder Creek. Water would then be diverted <br />to Dry Creek. This alternative could be operated in conjunction <br />with diversions to Baseline Reservoir or as a separate alternative. <br />Up to a maximum of 2, 000 cfs could be diverted with this alterna- <br />tive. The divers ion facility and the purchase of flood plain land <br />along Dry Creek to implement this alternative would cost about <br />$360,000 including land acquisition. Since this alternative should <br />be implemented in conjunction with other alternatives, benefits <br />were not separately computed. <br /> <br />Flood Detention Basins. Detention storage could also be considered <br />for this area. There is cons iderable open space on the we st side <br />of South Boulder Creek that could be utilized for this purpose. Also, <br />there is a smaller area on the east side of the creek that might be <br />utilized. <br /> <br />On the west side of the creek, there are a variety of configurations <br />that can be used for this alternative. The major variable is the <br />number of detention reservoirs. The use of a minimum of two <br />pools would create a significant amount of storage and a corres- <br />ponding large reduction in peak flow. However, such an alter- <br />native would require large diversion facilities to move the water <br />into the reservoirs fast enough to fill them during a relatively short <br />duration of a major flood and the embankments would have to be up <br />to 20 to 30 feet high to obtain the maximum amount of storage that <br />is feasible at the site. At the other extreme, a series of up to twenty <br />reservoirs could be constructed with no embankments, since exca- <br />vation could provide a series of shallow pools. This alternative <br />