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GROUND WATER PUMPAGE FROM THE SNAKE PLAIN AQUIFER, SOUTHEASTERN IDAHO, 1971
Description:
This report estimates the amount of ground water pumped from the Snake Plain aquifer in southeastern Idaho (170402). Emphasis is placed on the method used to estimate withdrawals for irrigation purposes. Ground-water withdrawals for irrigation needs were computed using the average number of kilowatt-hours of electrical energy consumed per acre-foot of water pumped and the total kilowatt-hours used by irrigation wells. A statistical technique was employed to determine sample size and location and to evaluate the accuracy of the results. A sample of 173 wells indicates that about 527 kilowatt-hours are used to pump 1 acre-foot of ground water from the Snake Plain aquifer. Using this coefficient and the total electrical power consumed by irrigation wells, irrigation pumpage is estimated to be about 1,000,000 acre-feet. Statistical evaluation of the sample population indicates that the results are accurate to within 10% of actual withdrawals. Municipal ground-water pumpage is estimated to be about 34,000 acre-feet, industrial pumpage about 38,000 acre-feet, and rural-domestic pumpage about 7,000 acre-feet. Total ground-water pumpage from the Snake Plain aquifer in 1969 for irrigation, municipal, industrial, and rural-domestic uses is estimated to be about 1,079,000 acre-feet. Young, H.W. and W.A. Harenberg. 1971. Water Information Bulletin No. 23. Idaho Department of Water Administration. 28 pp.