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<br />. <br /> <br />The average annual present level flows at Glen Canyon Dam for the <br />three runoff sequences selected for the preliminary studies are as <br />follows (31-year periods): <br />1934-1964 inclusive <br />1951-1968 plus 1906-1918 <br />1919-1949 inclusive <br /> <br />10,457,000 acre-feet <br />12,204,000 acre-feet <br />12,184,000 acre-feet <br /> <br />Net Gains Between Glen Canyon Dam and Lake Mead <br /> <br /> <br />From a comparison of records of Colorado River at Lees Ferry and <br /> <br /> <br />below Hoover Dam, with allowances for storage changes in Lake Mead, <br /> <br /> <br />evaporation losses and pumping from Lake Mead, there were estimated <br /> <br /> <br />the year by year historic net gains between Glen Canyon Dam and <br /> <br /> <br />. Lake Mead. These average about 883,000 acre- feet per year. The <br /> <br /> <br />yearly values are shown in the attached Table 3 dated February 1969. <br /> <br /> <br />This table was prepared by Region 3. <br /> <br />Upper Basin Depletions <br />These have been updated by Region 4 to 1968 levels with projected <br />depletions at Lee Ferry for years 1980, 2000, and 2030. <br /> <br />Increased annual depletions after 1968 (exclusive of losses from the <br /> <br /> <br />Colorado River Storage Project, which will vary from year to year <br /> <br /> <br />depending upon the storage content of the reservoirs) are estimated <br /> <br /> <br />to be as follows: <br /> <br />. <br /> <br />5 <br />