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<br />. <br /> <br />. <br /> <br />N <br />OJ. <br />rv <br />00 <br /> <br />Department of the Interior <br />Bureau of Reclamation (Reclamation) <br /> <br />Colorado River 3asin Salinity Control Program <br />Grand Valley Unit, Colorado - Construction of Stage One <br />of the Grand Valley Unit has been moving ahead satisfactorily <br />in 1982. Construction work began in October 1981 to con- <br /> <br />solidate 13 open-channel laterals presentlY serving the area <br />from the newly lined portion of the Government Highline <br /> <br />Canal, into 12 p;.pe laterals. Lateral construction ,.as about <br /> <br />70 percent complete at the end of August and should be <br /> <br />completed for the 1983 irrigation season. Stage One re- <br /> <br />presents only 10 percent of the Grand Valley salinity control <br /> <br /> <br />unit area and it is im~erative that salinity control measures <br /> <br />be implemented in the remaining portion of the unit as <br /> <br />rapidly as possible so that the Congre.ssional directives of <br /> <br />Public Law 93-320 can be achieved. <br /> <br />To test the effectiveness of Stage One, a water quality <br /> <br />monitoring program was initiated. <br /> <br />The results of this <br /> <br />p'rogram are being used to assess the effectiveness of Stage <br /> <br />One development in reducing salt loading. Hydrosalinity data <br /> <br /> <br />collected during the first year of monitoring in the Stage <br /> <br />One study area indicate that canal lining and the Department <br /> <br />of Agriculture's onfarm management have reduced salt loading <br /> <br />to the Colorado River by about 9,000 tons. By comparison, <br />the preconstruction estimate was 7,000 tons of salt per year <br /> <br />reduction from these facilities. <br /> <br />As a result of these <br /> <br />-3- <br /> <br />:lU ;,~i <br />