Laserfiche WebLink
<br />0004<17 <br /> <br />-18- <br /> <br />Colorado says that export di vers~ons of existing enterprises in Colorado, <br />as they are now constructed and will function in a year of normal climate, <br />will average 135,000 acre feet annually; and that detailed estimates by <br />individual projects appear in the statement submitted by Colorado at the <br />meeting held in Reno, Nevada, July 20, 1944. A comparAble figure for existing <br />exportations in Utah under normal conditions appears to be 79,000 acre feet, <br />making a total for the Upper. Basin of 214,000 acre feet annually. <br /> <br />. <br /> <br />34. Together, the existing depletions in the Upper Basin, resulting <br />from water consumption incident to the il"rigation of lands within the na- <br />tural basin and frcm export diversions for use outside the natural basin, <br />exclusive of allowances for projeots authorized but not constructed 'and <br />enterprises not yet comp let ed, as e stiooted by Co lorado engineers for the <br />average year of drouth cycles and normal periOds, may be summarized as <br />followsl <br /> <br />Drouth Cyc Ie <br /> <br />Normal Period <br /> <br />Irrigation Consumption in Upper Basin <br /> <br />1,812.000 <br /> <br />2,013.000 <br /> <br />Export Diversions out of Natural Basin <br /> <br />168 .000 <br /> <br />214.000 <br /> <br />Total Existing Upper Basin Depletions <br /> <br />1,980.000 <br /> <br />2,227 ,000 .. <br /> <br />.. The comparable figure derived from the Report may <br />approximate 2,129,000 aore feet. <br /> <br />. <br /> <br />35. In the LOW3r Basin, the Report includes depletions within the <br />natural basin with exportations for use outside the natural basin, the <br />sum of the two together with evaporation losses from ma.in-stem reservoirs <br />being 4,497,000 acre feet annually. Total consumption incident to the <br />irrigation of 890,200 acres of land within the natural basin (in Arizona, <br />Nevada, New I1exico and Utah) is estiJnated in the Report at 1,591,000 a.cre <br />feet annually; diversions from the River for the irrigation of 460.900 <br />acres of land in California are estimated at 2,193,000 acre feet amual1y; <br />and evaporation Losses from main-stem reservoirs are ~stimated at 713,000 <br />acre feet annually. Independent estimates by Colorado engineers indicate <br />that depletions of existing projeots in the Lower Basin, under normal <br />climatic conditions, will average 5,670,000 aCre feet annually, exclusive <br />of allomnces for irri gable lands of existing enterprises that have not <br />been irr igated up to the present time. Eltport diversions for use outside <br />the natural basin below Lee Ferry are given in the Report at 2,193,000 <br />acre feet annually., and are estimated from diversion data by Colorado en- <br />gineers at 2,700,000 acre feet amlUally. Evaporation losses from main- <br />stem reservoirs appear in the Report as 713,000 acre feet amually, and <br />are estimated by ColoradO engineers (froin streamflow records) at 800,000 <br />aore feet annually. Since the estimates of its engineers, with respect <br />to existing depletions in the Lower Basin, are substantially greater than <br />the estiJnates appearing in the Report, ColoradO suggests that the BureaU <br />of Reale.mation.re-exe.mine its calculations; and, in the event the revised <br />estimates are not materially increased, that the detailed information <br />