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<br />ABSTRACT <br /> <br />Dissolved mineral salts (salinity) adversely affects numerous urban and <br /> <br />~ <br />~ agricultural users of Colorado River water in the Southwestern U.S. and ln <br />o <br />~ Mex lco. More than a th1 rd of the salt load ls thought to be lnduced by <br /> <br />drainage from lrrlgated lands onto highly saline groundwater deposits ln the <br /> <br />Upper Colorado Basln in Colorado. Utah and Wyomlng. Varlous publlc polley <br /> <br />lnltlat1ves are proposed to lnduce farmers to reduce dlscharges of thls <br /> <br /> <br />nonpo1nt pollutant. Taxes on water. water conservatlon subsldles and land and <br /> <br />water rights purchases are analyzed in a llnear programmlng framework. The <br /> <br />allocatlve efflc1ency and the dlstrlbutlon of control costs and damages among <br /> <br />lrrlgators. water users and taxpayers are assessed. <br /> <br />1 <br />