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<br />. <br /> <br />The accompanying bar chart shows the historic annual flow and the <br />estimated annual virgin (or undepleted) flow at the Lee Ferry compact <br /> <br />point for the 73-year period, 1896 to 1968 inclusive. The chart <br /> <br />shows also the la-year PlOving averages of virgin flow. The longtiJlle <br /> <br />average annual virgin flow is nearly 15 million acre-feet. The <br />minimum year (1934) was about 6 million acre-feet and the maximum <br />year (1917) about 24 million acre-feet. <br /> <br />The following table shows the estimated average annual virgin flows <br /> <br />for various significant time periods. <br /> <br />. <br /> <br />Event <br /> <br />Period <br /> <br />Average annual <br />Years virgin flow <br />million acre-feet <br /> <br />Colorado River Compact <br />Boulder Canyon Project <br />Upper Colorado River Compact <br />Studies of Colorado River B~sin Proj. <br />Studies of Colorado River Basin Proj. <br />Current Studies <br />Actual record at Lee Ferry <br />Progress Report No.4 on W.Q. <br />Lowest la-year period of record <br />Lowest 12-year period of record <br /> <br />1903-1921 <br />1897-1928 <br />1914-1945 <br />1906-1965 <br />1906-1967 <br />1906-1968 <br />1922-1968 <br />1941-1966 <br />1931-1940 <br />1953-1964 <br /> <br />19 <br />32 <br />32 <br />60 <br />62 <br />63 <br />47 <br />26 <br />10 <br />12 <br /> <br />18.0 <br />16.9 <br />15.6 <br />15.1 <br />15.0 <br />15.0 <br />13.8 <br />13.5 <br />11.8 <br />11.6 <br /> <br />Present Level Flow at Glen Canyon Damsite <br /> <br />For purposes of projecting future operations of the reservoirs, the <br /> <br />past flows of the Colorado River at the Lees Ferry gaging station were <br /> <br /> <br />corrected for the difference between past depletions and the present <br /> <br />level depletions to represent flows as they would be with present <br /> <br />. <br /> <br />3 <br />