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<br />22.6 million acre-feet. Only once before, in 1920 and 1921, <br /> <br />~ did 20 million acre-feet of natural flow occur for two or <br />CJ1 <br />~ more consecutive years and only one other period (1920-1923) <br />-.1 <br />had an average natural flow exceeding 20 million acre-feet <br /> <br />(20.4 million). <br /> <br />preliminary data indicates that natural flow for 1988 <br /> <br />will be about 72 percent of normal. In each calendar year <br /> <br />1983 through 1986, flow to Mexico exceeded scheduled <br />deliveries by 12.6, 13.8, 10.1 and 9.2 million acre-feet, <br /> <br />respectively. <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 />end of calendar year 1987 was about 15.9 million acre-feet <br /> <br />greater than at the end of 1972. Of the total increase, 10.0 <br /> <br />million acre-feet was in the Upper Basin and 5.9 acre- <br /> <br />feet was in the Lower Basin. The 1987 end of calendar year <br /> <br />storage in the Colorado River system was about 245,000 acre- <br /> <br />feet less than the 1986 value. <br /> <br />During 1987 most of the major reservoirs on the Colorado <br /> <br />River were again filled to capacity and flows in excess of <br /> <br />demands were released. These continued 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 Lower Basin mainstream and Upper <br /> <br />Basin uses for calendar years 1973 through 1987 are shown on <br /> <br />Table 2. <br /> <br />-3- <br /> <br />.1 <br />