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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o <br />"'J <br />w <br />..... <br />w <br />..... <br /> <br />the 3~ year period, 1914-1945, as reported by the Upper Colo- <br />rado ~iver Compact Commission averaged 5,469,900 acre feet per <br />year. For the 18 year period of study, 1943-1960, the runoff <br />averaged 4,543,800 acre feet per year. This is 926,100 acre <br />feet or 16.9% less than the reported runoff for the earlier <br />32 year period. <br />The 18 year period of study, 1943-1960, includes the <br />higher than average 10 year period of 1943-1952 and the lower <br />than ayerage 8 year period of 1953-1960. The average annual <br />historic Lee Ferry runoff of the Colorado River for the 18 year <br />period was 11,318,000 acre feet while the average for the 35 . <br />year period, 1930-1964, was 11,559,000 acre feet. <br />The discharge of the Gunnison River to the Colorado <br />at Grand Junction during the 18 year study period averaged <br />1,706,500 acre feet per year. Subtracting this from the Colo- <br />rado River State line flow of 4,543,800 acre feet leaves <br />2,837,300 acre feet which represents the runoff of the main <br />stem Colorado River basin. If the estimated runoff of the <br />Little Dolores River and Coates Creek of 15,000 acre feet is <br />added to the 2,837,300 acre feet for the main stem Colorado <br />River, the total basin runoff is 2,852,300 acre feet. Data <br />on the main stem Colorado River basin runoff in relation to <br />the runoff of the Colorado River at Lee Ferry is given in <br />the following table: <br /> <br />5 <br />