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� <br />These needs were reviewed from the standpoint of identifying a practical, <br />Ieconomical means of satisfying the particular need. It was decided that <br />structural measures to satisfy only streamflow deficiencies, only flood <br />Icontrol, or only these two in combination would not be warranted from an <br />economic and environmental perspective. �herefore, the sub-basins <br />I experiencing irrigation shortages, as well as other needs, and the,Slate River <br />—� which experiences significant water quality problems were selected as the <br />� sub-basins to be studied for potential multipurpose structural components. <br />This resulted in eight sub-basins being investigated for potential structural <br />, components. <br />Several storage reservoirs were investigated to mitigate the..water <br />Iquality problems on the Slate River by providing dilution releases. These <br />reservoirs were eliminated from further consideration on the basis of high <br />Icost and their locations in environmentally sensitive areas. <br />Two types of structural components were identified to meet future <br />agricultural demands: conveyance systems to transfer water from one sub-basin <br />to another, and storage reservoirs. These were evaluated, and it was <br />determined that conveyance systems were not economically feasible and that <br />storage reservoirs provided the only practical means of ineeting projected <br />future agricultural water demands. <br />� A total of 57 potential reservoir sites were identified in the seven <br />sub-basins identified as having irrigation shortages. A preliminary screening <br />I of these 57 sites resulted in retaining eight alternative sites located in <br />three different sub-basins. Four of the seven sub-basins were eliminated from <br />further consideration because the shortages in these sub-basins were very <br />small in magnitude and the structural measures identified to satisfy the <br />shortages were found to be very costly. Eight reservoir sites were retained <br />4 for further study. These were: the Los Pinos and Pauline sites in the <br />Cochetopa Creek sub-basin; the Castleton site in the Ohio Creek sub-basin; and <br />I the Elko and Sargents No. 1, 2, 3 and 4 sites in the Tomichi Creek sub-basin. <br />The locations of these potential reservoir sites are shown on Figure 5.1. <br />5-7 <br />� <br />