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<br />~ <br /> <br />The fo~~owing tabu~ations for calendar year 1996 show final records of diversions of water <br />from the mainstream of the Colorado River, return flow of such water to the mainstream and <br />consumptive use of such water. The records were furnished by the U.S. Geological Survey, <br />International Boundary and Water Commission, Bureau of Indian Affairs, Bureau of Reclamation <br />(Reclamation), National Park Service, U.S. Fish and Wildlife Service, and water user <br />agencies. Diversions from the All-American Canal and Gila Gravity Main Canal at Imperial Dam <br />were assigned to each user by adding each user's proportional share of the total canal losses <br />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 <br />Colorado River flood plain. Amounts diverted by pumping were determined by: (1) For most <br />electric pumps, diversions were computed on a monthly basis from power records and a <br />"kilowatthour per acre-foot factor" that was determined by discharge measurement; (2) For <br />pumps other than electric and some electric pumps, a consumptive use factor of 6 acre-feet <br />per irrigated acre per year was used. <br /> <br />.e.. .. <br />There are undeterm1ned amounts of unmeasured return flow reach1ng the Colorado R1ver by means <br />of flow through aquifers connecting water use areas to the mainstream. Reclamation, working <br />with the U.S. Geological Survey, is continuing the research and investigative program to <br />determine the amounts of such unmeasured return flows. <br /> <br />Tabulations for calendar year 1996 do include acceptable determinations of the unmeasured <br />Colorado River return flows to Lake Mead from Las Vegas Wash Which accrue the State of Nevada <br />and a portion of the unmeasured return flows from the Yuma Mesa which are credited to the <br />State of AriZona. <br /> <br />No person or entity is entitled to divert or use Colorado River water without an entitlement. <br />An entitlement is an authorization to beneficially use Colorado River water pursuant to: (1) <br />a right decreed by the Supreme Court, (2) a contract with the United States through the <br />Secretary of the Interior (Secretary), or (3) a Secretarial reservation of water. The <br />recording of diversions, return flows, or consumptive use in this tabulation is for <br />statistical use only and is not to be interpreted as an entitlement, indication that the use <br />is authorized, or imply that return flow credits are associated with a specific entitlement. <br /> <br />8 <br /> <br />c <br />c:.> <br />o <br /><.Q <br />0) <br />c.n <br />