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<br />(6) Dams. In viev of the effect of runoff from the <br />Bijou Creek basin on the flood problems along the lower South <br />Platte River, storage facilities in the Bijou Creek hasin vould <br />offer the greatest potential for reducing the flood problems <br />vithin the basin and along the lover South Platte River. A <br />potential system of flood control dams, located to provide <br />virtually complete hydrologic control in the Bijou Creek basin, <br />vas evolved. Successive refinement of the system led to a plan <br />vhich vould provide the best solution, within the limits of <br />system economic justification, to the flood problems. <br /> <br />(7) Combinations. The ultimate solution of the flood <br />problems in the Bijou Creek basin requires a combination of <br />structural and nonstructural measures. An effective combination, <br />however, would require that the structural element of the combinatio <br />provide a significant reduction in flood damage potentials. A I <br />system of dams offers the most effective structural method of reduci <br />potential flood damages. Other flood plain management measures <br />would reduce residual flood damages in the communities protected, <br />in part, by the potential system of dams. <br /> <br />c. Wat~s~1Jc. The major water supply problem in the <br />Bijou Creek basin is the continuing depletion of the groundvater <br />acouifer from which the present supplies are dravn. I'Tater yie Ld <br />from the basin avera~es about 10,000 acre-feet anuually. A major <br />portion of this runoff could be trapped in potential reservoirs <br />and released slowly, resulting in recharge of the hasin's declining <br />acquifer. Early in the economic life of potential reservoirs <br />runoff could ue temporarily stored in the sediment storage zones. <br />As t~e sediment storage becomes depleted, reallocation of the flood <br />storage zone could be accomplished with minimal looses to the flood <br />control effectiveness of the reservoirs. The hasi n r S ...rater supply <br />could be au~ented t)rrol~h diversiono from upstream nortions of <br />the South Platte River basin. f;ince that source is currently <br />over:l;"l'ropriated. this solution is highly unlikely. Potential <br />reservoir;.; may provide an oT1!,ortunity, however, for storing <br />treated effluent from the metropolitan Denver area. The water <br />management aspects of the potential Bijou Creek reservoirs, as they <br />relate to the entire South Platte River basin, will be considered <br />as part of the broadened investigation discussed earlier. <br /> <br />~. Ero~io~~nd sedi~~nta~io~. The potential reservoirs <br />would reduce sediment problems in the d01mstream portion of the <br />Bi,jon Creel'. basin and along the lower South Platte River by <br />impounding a major portion of the Bijou Creek basin's sediment <br />runoff. Reduction of floodflows do>rnstream from the dams would <br />also reduce the rate of bankline erosion. Erosion which endangers <br />bridges. bridge approaches, and other public works could be con- <br />trolled on an as-needed basis under emergency authorities <br /> <br />310!\ <br /> <br />23 <br /> <br />.. <br />I <br /> <br />. <br /> <br /> <br />, <br />.' <br />. ; <br />, <br />. <br /> <br />~ <br /> <br />~ <br />f <br />