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<br />. <br /> <br />(1968) developments in the Upper Basin. The historic effects of the <br />operations of the reservoirs of the Colorado River Storage Project <br />were taken out of the record in recent years so that the "1968 <br />IOOdified flows" represent unregulated flow at Glen Canyon damsite. <br /> <br />The accompanying Table 1, prepared in the Salt Lake City Office, <br />February 1969, shows these estimated flows, by months, for the <br />63-year period, 1906-1968 inclusive. The maximum water year flow <br />is estimated to be 20,366,000 acre-feet (1917) and the minimum <br />3,767,000 acre-feet (1934). The average for the 63-year period <br />is 12,168,000 acre-feet. <br /> <br />. Runoff Sequences Used in Preliminary Reservoir Operation studies <br />Studies were made for three runoff sequences for the 31-year period, <br />1970 to 2000 inclusive, as follows: <br />a. Minimum runoff sequence (about 98 percent chance of being <br />equaled or exceeded) <br />b. Median runoff sequence <br />(1) High years early in the runoff sequence, 1919 to 1949 <br />inclusive <br />(2) High years late in the runoff sequence, 1951 to 1968 <br />followed by 1906-1918 <br /> <br />The attached Table 2 shows the average annual present level flows for <br /> <br /> <br />63 historic 31-year runoff sequences at the Glen Canyon damsite. <br /> <br />. <br /> <br />4 <br />