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<br />. <br /> <br />. <br /> <br />Figure II-2 <br /> <br />The Salt Loading Process <br /> <br />I'\;l' <br /><:> <br />tv <br />,~ <br /> <br />~ <br />~., <br />CI) ~ <br />.... <br />.~ Q:: <br />~ <br /> <br />. <br /> <br /> <br /> <br />Irrigated Crap I.ands <br />, <br /> <br />I.ayer <br /> <br />~--, - - -I-t- -L- -'"--d' '"-:-- ------------ --".-..--""':-#:-:-:-:-:.;:-:-:.;:::::-:-:;. <br />--------50 00 Inq-#-j--------- ---------~~------------- <br />.;::~~~~~~!~~~~lii111*1~liii_~~~ij~~~~~! <br /> <br />GREEN RIVER FORMATION <br /> <br />SOURCE OF SALT LOADING <br /> <br />'w _,,'_~' ....'._. . <br /> <br />There are approximately 1 ~llion acres of irrigated cropland in 17 identified <br />salt sources units in the Colorado Basin. Ten of these units are presently <br />considered feasible salinity control projects and would involve treatment on <br />nearly 700,000 acres of irrigated cropland: upon full implementation. <br /> <br />D. The Colorado River Basin Salinity Control Act <br /> <br />Salinity Control in the Colorado River Basin is addressed in the Colorado <br />River Basin Salinity Control Act of 1974, Public Law 93-320. The Act has two <br />major sections. Title I of the Act relates to maintaining the water quality <br />(salinity concentrations) standards which the United States agreed to on <br />August 30, 1973, in Minute 242 of the Intetnational Boundary and Water <br />Commission for water delivered to Mexico under the Mexican Water Treaty of <br />1944. This section relates to a program f~r improving irrigation efficiencies <br />and reducing highly saline irrigation drai~age return flows from the <br />Well ton-Mohawk Irrigation and Drainage District. Title I also authorizes the <br />USDI to proceed with the design and construction of a large desalinization <br />plant to treat excess irrigation drainage return flowa from the Well ton-Mohawk <br />area. <br /> <br />. <br /> <br />Title II of the Act deals specifically with the salinity concentrations in the <br />Colotado River above Imperial Dam, and the 'controls necessary to meet United <br />States water quality (salinity concentration) standards established by the <br />seven basin States and the EPA. The Secretary of Interior was authorized to <br />undertake various investigations and studies to deter~ne the nature of salt <br />loading problema, potential salinity control solutions, and costs. The <br />Secretary also received authorization to proceed with construction of certain <br />salinity control projects. <br /> <br />6 <br />