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<br />The following tabulations for calendar year 1989 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 tbe U.S. Geological Survey. International Boundary and Water Commission. <br />Burean of Indian Affairs. Bureau of Reclamation (Reclamation). National Park Service, U.S. Fish and Wildlife Service. and water user agencies. Diversions <br />from the Ail-American Canal and Gila Gravity Main Canal at Imperial Dan were assigned to each user by adding each user's proportional share of the total canal <br />losses to the delivery taken by each 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 per 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. Reclanation. 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 1989 do include acceptable 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 />J <br /> <br />" <br /> <br />Co:;' <br />'-' <br />~... <br /><;.;.I. <br /><-0. <br />(.)1. <br />