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<br />001229 <br /> <br />which generally occurred during the late summer months. Based on an <br />irrigation efficiency of 60%, the canals theoretically lost 68,000 <br />acre feet per year of consumptive use of irrigation water. If this <br />consumptive use loss is added to the reduced flow at the state line, <br />the apparent basin depletion approximates 173,000 acre-feet per year. <br />The average annual amount of water pumped from wells, based on <br />data obtained from the U. S. Geological Survey is as follows: <br /> <br />ESTIMATED PUMPAGE OF GROUND WATER IN ARKANSAS VALLEY <br /> <br /> In Acre-Feet per Year <br />Year Amount Year Amount Year Amount <br />1940 2,300 1949 23,000 1958 79 ,000 <br />1941 5,000 1950 31,000 1959 154,000 <br />1942 6,000 1951 31,000 1960 146,000 <br />1943 7,000 1952 46,000 1961 121,000 <br />1944 8,500 1953 58,000 1962 132,000 <br />1945 9,200 1954 94,000 1963 215,000 <br />1946 15,000 1955 98,000 1964 227,000 <br />1947 15,000 1956 152,000 1965 113,000 <br />1948 15,000 1957 84,000 <br /> Ave rage Pump age 1940-49 10,600 <br /> 1950-59 83,000 <br /> 1960-64 168,200 <br /> <br />The .average annual pumpage from 1953 through 1965 approximated <br /> <br /> <br />128,700 acre-feet. The average annual consumptive use on this amount of <br /> <br />water would have been 103,000 acre-feet, based on the U.S. Geological Survey <br /> <br />estimate of 80% consumptive use factor. <br /> <br /> <br />The effect of ground water withdrawal on those who do not have pumps <br /> <br /> <br />can be illustrated by use of the Fort Lyon Canal. It is estimated that 277 <br /> <br /> <br />wells, having a total capability of pumping approximately 420 cfs, provide <br /> <br /> <br />a supplemental water supply to 40% to 50% of the land under the canal. <br /> <br /> <br />The remaining 50% to 60% of the land must rely on direct flow <br /> <br /> <br />and reservoir storage water. As a result, the owners of wells obtain <br /> <br />11 <br /> <br />