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<br />001073 <br /> <br />Draft - 9/81 <br /> <br />Appendix I <br /> <br />The Denver BasIn <br /> <br />As po inted out in Chapter 2, the Denver Basin contains five <br /> <br />. <br />different aquifers. These are discussed below in descending <br /> <br />order of elevation. <br /> <br />This information is drawn from the Report on the Ground <br /> <br />Water Resources of the Bedrock Aquife.rs of the Denver Basin, <br /> <br />Colorado (Romero, 1975). <br /> <br />Dawson Group <br />The Dawson group consists of the Dawson Arcose, the Denver <br /> <br />~ <br /> <br />Formation, and the Arapahoe FormatIon. For purposes of this <br /> <br />study, the group will be considered as a whole. As the closest <br /> <br />aquifer to the surface in the basin, the Dawson group is the most <br /> <br />heavily used. The group is up to 2,800 feet in thickness and <br /> <br />occupies the central part of the Denver Basin. <br /> <br />In 1974, 93$ of <br /> <br />the 6,062 welis registered in the group were of the domestic or <br /> <br />stock type. ("Domestic" wells are limIted to 50 gpm; stock wells <br /> <br />seldom produce more than 25 gpm.) Based on operating times of <br /> <br />about 70 percent of a 24-hour day, approximately 123,000 acre- <br /> <br />feet of water were withdrawn by all the operating wells in the <br /> <br />aquifer in that year. Based on economically recoverable storage <br /> <br />of 50 percent, 18 million acre-feet of water can probabiy be <br /> <br />removed by pumping from storage. <br />