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<br />, " <br /> <br />,f,_ <br /> <br />N <br />W <br />-J <br />co <br /> <br />Hoover Dam -- Virgin flow at Lee Ferry of 14 million <br />acre-feet/year or more with the moderate depletion rate. <br /> <br />Parker Dam -- Virgin flow at Lee Ferry of 14 million <br />acre-feet/year or more with a low depletion rate and 15 <br />million acre-feet/year or more with the moderate depletion <br />rate. <br /> <br />Imperial Dam -,- virgin flow at Lee Ferry of 14, million <br />acre-feet/year or more with a low depletion rate and, 15 <br />million acre-feet/year or more with the moderate depletion <br />rate. <br /> <br />Water Supply <br /> <br />The virgin flow at Lee Ferry, as estimated by the U. S. <br />Bureau of Reclamation, for the water years 1973 through 1976 <br />is shown in Table 1. <br /> <br />TABLE 1 <br /> <br />Virgin Flow at Lee Ferry <br />(1,000 Acre-Feet) <br /> <br />1973 <br />1974 <br />1975 <br />1976 <br /> <br />Flow <br /> <br />19,321 <br />13,194 <br />16,898 <br />11,451* <br /> <br />Water Year <br /> <br />It now appears that 1977 will be the driest year on <br />record with a virgin flow at Lee Ferry estimated at approxi- <br />mately 5.3 maL <br /> <br />Storage Changes <br /> <br />Upper and Lower Basin reservoir storage increased since <br />1972 as shown on Table 2. Basinwide storage at the end of <br />1976 was about 8.8 million acre-feet greater than at the end <br /> <br />*Provisional, subject to revision. <br /> <br />3 <br /> <br />" <br /> <br />'/,ti.; <br />