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<br />(d) Dams. Hydrologic control of a basin's runoff <br />normally offers the most practicable method of reducing the <br />flood damage potentials in a basin. Construction of impound- <br />ments ~ediately upstream from the developed areas of the Sand <br />Creek basin would control about 60 percent of the basin's <br />drainage area. Due to tributary inflov from the urbanized <br />areas of the basin downstream from the impoundments, residual <br />flood problems vould exist. <br /> <br />(e) Combination of measures. Construction of <br />impoundments upstream from the developed areas of the basin, in <br />combination with either or both structural or nonstructural <br />measures downstream, appears to be the most practicable solution <br />to the basin's flood problems. In addition, the impoundments in <br />combination vith the Cherry Creek, Chatfield, and Bear Creek <br />Dams and Reservoirs vould provide a substantial reduction of <br />flood dlllllage potentials along the South Platte River downstream <br />trom Denver. <br /> <br />d. Recreation. The increasing demand for additional vater- <br />based recreation facilities could be met by the construction of <br />corollary recreation facilities at potential reservoir sites. <br />Permanent recreation pools vould not, hovever, be possible vith- <br />out the importation of vater. The provision of recreational <br />facilities at the reservoirs which would not require the importa- <br />tion of large amounts of vater vas also studied. The design of <br />the reservoirs for flood control vould not preclude the possible <br />use of the sediment pools for recreation, if a source of vater <br />is found after the reservoirs are completed. <br /> <br />e. Water quality. ~reatment of the basin's vaste vater <br />effluent appears to be the most practicable solution to the <br />basin's vater-quality problems. There is insufficient vater <br />yield to consider low-flov augmentation as a means of water <br />quality control. <br /> <br />f. Erosion and sedimentation. Erosion vhich endangers <br />bridges, bridge approaches, and public works can be controlled <br />on an as-needed basis under emergency authorities available to <br />the Corps of Engineers. Expanded application of conservation <br />practices throughout the basin should be pursued. Sediment <br />control vould result from the construction of multiple-purpose <br />dams and reservoirs with allowance for sediment storage. <br /> <br />g. Summary. The flood, recreation, and vater-quality <br />problems of the Sand Creek basin are the result of the rapid <br />urbanization of the downstream portions of the basin. The <br />problems can best be resolved by the storing of surplus flovs, <br /> <br />50 <br />