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<br />. <br />;J~ " <br />_,::1 <br /> <br />VII. ECONafIC BENEFITS <br /> <br /> <br />The Dallas Creek Project is an integral part of the Colorado <br />River Basin. Since this study has been made in advance of a <br />comprehensive study of ~he Colorado River Basin, certain overall <br />effects (beneficial and adverse), attributable to water quality <br />control must await subsequent confirmation. This study does not <br />include the effect of the Uncompahgre River on the Gunnison River. <br />However, any improvement in'water quality of the Uncompahgre River <br />will reduce the concentration of total dissolved solids in the <br />Gunnison River and in turn the Colorado River. A reduction in con- <br />centration of total dissolved solids would be beneficial to down- <br />stream water users. <br /> <br />. .~ <br /> <br />Annual dilution water requirements to maintain existing water <br />quality (about 1,600 mg/l TDS) at Delta, with the Dallas Creek <br />Project, and requirements to maintain total dissolved solids of <br />1,000 mg/l at Delta without and with the Dallas Creek, Project are <br />as fo Bows: <br /> <br />i-:_:- <br />;....'.;. <br />:::Bt <br /> <br />::_.::~J <br /> <br />Annual Dilution Water <br />Requirements at Delta* <br />(acre-feet) <br /> <br />To maintain existing TDS (about 1,600 mg/l) <br />with Project <br /> <br /><;-. <br /> <br />74,000 <br /> <br />To maintain l,OOO mg/l, TDS without <br />Project <br /> <br />197,000 <br /> <br /> <br />To maintain l,OOO mg/l, TDS with <br />Project <br /> <br />234,000 <br /> <br />A review of historical streamflow data indicates that ~tream- <br />flows are inadequate to meet the above requirements. However, a <br />reduction in these requirements could be expected through improved <br />farm management practices, as well as removing small areas of <br />presently irrigated' lands that may be producing a large part of <br />the existing salt load, thereby reducing total dissolved solids <br />in the Uncompahgre River. <br /> <br />*Considering dilution water to be equivalent in quality to <br />Ridgway Reservoir water <br /> <br />33 <br /> <br />" <br />'~,. <br />