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<br />12 <br /> <br />o <br />:, <br />~ <br />N <br />C) <br />,'""" <br /> <br />of Reclamation, and any other pertinent <br />agencies, This study team would <br />establish g(rldelines for computing what <br />amounts of'ground water pumped <br />should be cParged against the Colorado <br />River Basm. These guidelines will need <br />to be established on an area by area <br />basis rather than one set percentage for <br />the entire basin. Results of this study <br />will be incon>orated in future <br />Consumptive Uses and Losses Reports. <br />However, until these guidelines are <br />established, the Consumptive Uses and <br />Losses Rewrts will continue to report <br />all ground-water pumpage as depletion <br />from the system. <br /> <br />Currently, the Arizona portion of the <br />Upper Basip is ,the only part of the <br />basin that teports ground-water <br />pumpage as consumptive use, 'Although <br />significant ground-water usage occurs in <br />Arizona, Nevada, and New Mexico, for <br />purposes of:this report ground-water <br />overdraft has not heen taken into <br />account in ~e computation of tributary <br />consumptiv~ use. It should be noted <br />that present ground-water overdraft in <br />Arizona haS been estimated to be <br />approximately 2.2 million acre-feet per <br />year. <br /> <br />Stockpon~ Evaporation <br />and Livestock <br /> <br />Stockpond surface areas were estimated <br />from the May 1975 Soil Conservation <br />Service (SCS) publication, "Livestock <br />Water Use." The subbasin stockpond <br />areas were subdivided by State and <br />basin using:the livestock population <br />distribution! The same procedure used <br />to calculate :the unmeasured reservoir <br />evaporation;was used to estimate the <br />stockpond evaporation. <br /> <br />Livestock population data were taken <br />from annual State Agriculture Statistics <br />and the 1978 and 1983 Census oC ' <br />Agriculture, Livestock population data <br />included cattle, sheep, horses, and hogs. <br />Consumption rates for the various <br />livestock were derived from various <br />reports, including the SCS publication, <br />"Livestock Water Use," May 1975, <br /> <br />Stockpond and livestock data are <br />adequate to prepare an estimateoCthis <br />use. Considering the small amountoC <br />water use, any refining effort would be <br />best spent on the irrigation or <br />evaporation categories. <br /> <br />Minerai Resources <br /> <br />Arizona leads the nation in the produc- <br />tion of copper and the net water use for <br />its production represents about 90 per- <br />cent of the total water use for mineral <br />resources in the Lower Basin. The <br />Upper Basin uses water in the <br />production of numerous minerals in <br />addition to energy-related materials <br />such as oil and natural gas. <br /> <br />Estimates of the water consumptively <br />used were based largely on phone <br />surveys conducted by the U.S. Geological <br />Survey in 1985, that quantified water <br />use in the basin. Intermediate years <br />were interpolated between 1980 and <br />1985. In some cases where, for privacy <br />reasons, companies were unwilling to <br />supply information, information was <br />obtained from the U.S. Bureau of Mines. <br /> <br />Thermal Electric Power <br /> <br />The net use of water for the production <br />of thermal electric energy from the <br />