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<br />::.....;;.:..r~; <br />.::....1]... <br /> <br />c <br />.:J <br /> <br />~-:-.:) <br /> <br />~ <br />c' <br />~ <br /> <br />. 'Ji.c... <br />'-' <br />.'..-.1"' <br />,.,'j.' <br /> <br />TECHNICAL MEMORANDUM <br />STATE OF COLORADO <br /> <br />Upper Colorado River Basin <br />Consumptive Uses and Losses Report 1996-2000 <br /> <br />Purpose <br />The purpose of this technical memorandum is to document the methodology used to <br />estimate the man-caused consumptive uses of water from the Upper Colorado River in the <br />state of Colorado for the period from 1996 to 2000. <br /> <br />Agriculture <br />Agricultural consumptive use is divided into three categories: irrigation, stock pond, and <br />livestock. Irrigation use includes all consumptive use related to irrigating crops, including <br />the incidental losses. Stock pond use is the evaporation that occurs from stock ponds and <br />livestock use is the water consumed by livestock. <br /> <br />Irriaation <br />Irrigation consumptive use is defined as the net irrigation requirement (NIR) plus incidental <br />losses. The NIR is the crop consumptive use (evapotranspiration or ET) minus effective <br />precipitation. The NIR was computed using Reclamation's XCONS2 computer program. <br />This program is based upon the SCS Modified Blaney-Criddle ET estimation model as <br />presented in the U.S. Department of Agriculture, Soil Conservation Service's Irrigation <br />Water Requirements Technical Release No. 21 (TR 21). An explanation of XCONS2 and <br />its required inputs can be found in Appendix A of the Methods Manual for Colorado River <br />System Consumptive Uses and Losses Report 1985-1990. <br />