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<br />~ <br /> <br />~ <br /> <br />The followlng tabulations for calendar year 1988 show final records of diversions of water from the mainstream of the Colorado River. return flow of such water <br />to the mainstream and consumptive use of such water. The records were furnished by the U.S, Geological Survey, International Boundary and liater Commission, <br />Bureau of Indian Affairs. Bureau of Reclamation (Reclamation), National Park Service, U,S, Fish and Wildlife Service. and water user agencies. Diversions <br />from the All-American Canal and Gila Gravity Main Canal at Imperial Dam were assigned to each user by adding each user's proportional share of the total canal <br />losses to the delivery taken by eacb user at its turnout from the canal, <br /> <br />The tabulations also show quantities of water pumped from the mainstream or from wells in the Colorado River flood plain, Amounts diverted by pumping were <br />determined by: (1) For most electric pumps. diversions were computed on a monthly basis from power records and a "kilowatthour per acre-foot factor" that <br />was determined by discharge measurement; (2) For pumps other than electric and some electric pumps, a consumptive use factor of 6 acre-feet p,r irrigated acre <br />per year was used, <br /> <br />There are undetermined amounts of unmeasured return flow reaching the Colorado River by means of flow through aquifers connecting water use areas to the <br />mainstream. Reclamation. working with the U.S. Geological Survey, is continuing the research and investigative program to determine the amounts of such <br />unmeasured return flows. <br /> <br />Tabulations for calendar year 1988 do include acceptahle determinations of the unmeasured Colorado River return flows to Lake Mead from Las Vegas Wash which <br />accrue the State of Nevada and a portion of the unmeasured return flows from the Yuma Mesa which are credited to the State of Arizona, <br /> <br />5 <br /> <br />c> <br />CI <br />~ <br />"~ <br />~ <br />~ <br />