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<br />001080 <br /> <br />Draft - 9/81 <br /> <br />Laramie Formation <br /> <br />~) <br /> <br />Little is known about the Laramie Formation and no figures <br /> <br />are available on water withdrawn from the aquifer. Based on <br /> <br />estimates of a 40-foot saturated thIckness, a specific yield of <br /> <br />10 percent and a recoverability factor of 25 percent, there are <br /> <br />probably three millIon acre-feet of water in storage that could <br /> <br />be recovered by wells. <br /> <br />Laramie-Fox Hills Aquifer <br />As of 1974, approximately 600 wells were known to tap the <br /> <br />Laramie-Fox Hills Aquifer, of which 83 percent were classified as <br /> <br />domestic-stock wells. This cemented sandstone aquIfer exists <br /> <br />under artesian conditions throughout most of the Denver Basin. <br /> <br />According to 1974 records, a total of 16,500 acre-feet per year <br /> <br />was being withdrawn from the aquifer. <br /> <br />It is reported that "with <br /> <br />-J <br /> <br />a specific yield of 15 percent about 65.7 million acre-feet could <br /> <br />be drained by gravity." (Romero, 1975, p. 45.) The quantity <br /> <br />which can be removed by wells is probably considerably smaller. <br /> <br />Assuming 50 percent recoverability, approximately 32.9 million <br /> <br />acre-feet would be available. <br /> <br />Dakota Group <br /> <br />The Dakota formation has not yet been heavily tapped; less <br /> <br />than 20 known domestic wells tap it (Romero, 1975, p. 39). In <br /> <br />. <br /> <br />predicting annual withdrawal, the report cited assumed a popula- <br /> <br />tion of from 60 to 100 persons using the aquifer and further <br /> <br />assumed their datly per capita water consumption to be 50-100 <br /> <br />gallons. Based on these assumptions, the annual withdrawal of <br /> <br />water would be between 4 and 7 acre-feet. Due to certain <br /> <br />) <br /> <br />2 <br />