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<br />. <br /> <br />1,000 acre-feet <br /> <br />Year <br /> <br />Increase over 1968 <br /> <br />1968 <br />1980 <br />1990 <br />2000 <br />Average for 31 years, <br />1970-2000 inclusive <br /> <br />o <br />1,317 <br />1,734 <br />2,151 <br /> <br />1,405 <br /> <br />Lower Basin Consumptive Use <br /> <br />For recent years, uses from the mainstream in the Lower Colorado River <br /> <br />Basin are determined from measured diversions and returns as follows: <br /> <br /> 1,000 acre-feet (values rounded) <br /> CY Arizona California Nevada Total <br />. 1964 1,127 5,065 25 6,217 <br /> 1965 1,009 4,900 23 5,932 <br /> 1%6 1,073 5,097 27 6,197 <br /> 1967 1,042 4,887 27 5,956 <br /> 1968 1,097 5,073 34 6,204 <br /> <br />In projecting the estimates of future consumptive use, it was assumed <br /> <br />that the Central Arizona Project facilities for diversion of Colorado <br /> <br />River water would become available in year 1980. <br /> <br />Region 3 has estimated the "normal" annual demands at Lake Mead (after <br /> <br />Central Arizona Project facilities become available, these represent <br /> <br />2,800,000 acre-feet annual use in Arizona; 4,400,000 acre-feet annual <br /> <br />use in California; Nevada demands up to 300,000 acre-feet; and <br />. 1,500,000 acre-feet to Mexico) as follows: <br /> <br />6 <br />