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<br />N <br />~ <br />..-a The natural flow for 1977 at Lee Ferry of 5.47 maf was the <br />W <br /> <br />driest year on record for the period 1906-1985, and 1984, <br /> <br />with a flow of 24.5 maf, was the wettest. <br /> <br />Storage Changes <br /> <br />Upper and Lower Basin reservoir storage has increased <br /> <br />since 1972 as shown on Figure 1. Basinwide storage at the <br /> <br /> <br />end of calendar year 1984 was about 16.3 million acre-feet <br /> <br />greater than at the end of 1972. Of the total increase, 10.8 <br /> <br />million acre-feet was in the Upper Basin and 5.5 acre- <br /> <br />feet was in the Lower Basin. The 1984 end of calendar year <br />storage in the Colorado River system was about 40,000 acre- <br /> <br />feet less than the 1983,value. <br /> <br />During water year 1985 most of the major reservoirs on <br />the Colorado River were filled to capacity and flows well in <br /> <br />excess of demands were released. These large flows produced <br /> <br />reductions in salinity concentrations in all of the major <br /> <br />reservoirs. <br /> <br />Historical Uses <br /> <br />Estimated historical Upper Basin and Lower Basin <br /> <br />mainstream uses for calendar years 1973 through 1984 are <br /> <br />shown on Table 2. <br /> <br />-3- <br />