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<br />'<<>;~ <br />r'... <br />M <br />...., <br />(;;J <br />(::) <br /> <br />This study continues some of the aspects reported in <br /> <br />"M.emorandum on Operation of Rio Grande Compact" from R. J. Tipton, <br /> <br />Consulting Engineer, to the Colorado Water Conservation Board, <br /> <br />January 1955. Table I has been extended through 1975. <br /> <br />(see appendix) <br /> <br />Table II of the 1955 report (see appendix) lists the net <br /> <br />change in irrigated 'area for the Conejos as +5900 acres from 1936 <br /> <br />to 1954,. a +6.4 percent change. .The ne.t change for the Rio Grande, <br /> <br />including the Closed Basin is +29,900 acres, or 7.4 percent. For <br /> <br />.the purpose of this study, the crop consumptive use. requirement <br /> <br />(evapotranspiration less effective rainfall) is generalized at 1.0 <br /> <br />acre-foot per acre for the above net changes in acreage. <br /> <br />Tipton states (page 10): "In recent years, well.development in <br /> <br />the San Luis Valley has been rapid. <br /> <br />It was reported in 1928 there <br /> <br />was only one shallow well in the Valley utilized for irrigation. In <br /> <br />1936, according to reports there were 176 pumping plants in opera- <br /> <br />tion, and in 1952 an. estimated 1300." Also, he states "that the <br /> <br />number of artesian wells in the Valley increased from some 1600 in <br /> <br />1890 to 6000 in 1936, and to 7500 in 1952." He notes that prac- <br /> <br />tically all of the 10,200 acres in the Southeast Area, as shown in <br /> <br />Table II, is served from ground water, some of which comes from deep <br /> <br />aquifers. " <br /> <br />Table II sets forth the delivery departures from the Compact <br /> <br />-5- <br />