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WSP10896
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Last modified
1/26/2010 3:15:08 PM
Creation date
10/12/2006 4:35:30 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8200.400
Description
Colorado River Basin - Briefing Documents-History-Correspondence
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
3/28/1945
Author
CWCB
Title
Statement of State of Colorado by CWCB - Concerning Report on Colorado River Basin in Preparation by BOR
Water Supply Pro - Doc Type
Report/Study
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<br />OOO~J6 <br /> <br />-17- <br /> <br />'. <br /> <br />comparable in completeness and accuracy with that of the Bureau of Reclama- <br />tion. Colorado says, however, that U. S. Census Bureau data concerning <br />pcpulations are used in the Report; and that Census Bureau reports cn irri- <br />gation should not be disregarded inasmuch as they are the principal sources <br />of information for the historic period during which depletions and virgin <br />flows have been calculated, and is information which has been compiled in <br />each census year under uniform definitions that are applicable to both ba- <br />sins and all States alike. <br /> <br />32. The quantity of w!l.ter consumed within the natural basin above <br />Lee Perry. by the irrigation of 1.256,800 acres of land therein, is esti- <br />mated in the Report at 1,948,000 acre feet armu!l.l1y. Although unit rates <br />of water consumption are not disclosed in the Report, the total is equiva- <br />lent to 1.55 aore feet per acre irrigated, and the Report assumes the same <br />consumption per year in both arouth cycles, such ao 1931-1940 and in normal <br />or 'long-time periods. Colorado engineers estimate that total water con- <br />sumption within the Upper Basin by existing irrigated lands will average <br />2,013.COO acre feet under normal conditions, - a figure derived from the <br />application of a somewhat smaller unit rate to a somewhat gre~ter acreage.- <br />and will average 1.812,000 acre feet per year during a drouth cycle such <br />as 1931-1940. Colorado engineers say that the unit rate of vater consump- <br />tion adopted in the Report may be applicable to the problem of estimating <br />water consumption in the basin under full-supply conditions. but that the <br />adopted rate llUly be too high, considering the relatively large acreage <br />served by unregulated and erratic tributary streamflows, for which present <br />irriGation is inadequate. They say that water consumption in the a.verage <br />year of a drouth cycle such as 1931-1940 is necessarily sub-norma.l for the <br />reason that diversions and applications of water, the contributions to <br />ground storage. and the return flows durine; such a period are below average; <br />that much of the acreage is irrigated indifferent ly and some not a.t all <br />during drouth cycles; that transpiration losses are reduced by the impsir- <br />ed crop yields; and that the abovo mentioned factors more than offset the <br />higher temperatures and evaporation rates of longer drouth seasons. Colo- <br />rado says the Report recognizes the sub-normal depletions of drouth cycles <br />with respect to both export diversions and evaporation losses from main- <br />stem reservoirs, and suggests the same recognition be given to ,vater con- <br />sumption incident to the irrigation of lands within the natural basin. <br /> <br />. <br /> <br />33. Existing export diversions above Lee Ferry. for use outside the <br />natural basin, exc lusive of allowances for future exportations of author- <br />ized projects, are estill'ated in the Report at 102.000 acre feet in Colo- <br />radO and 66,000 acre feet in Utah. or a total of 168,000 aore feet per <br />year during a drouth cycle such as 1931-1940. Details are not shown for <br />normal conditions, and the summary tabulation (pa~os 103 and 104) is con- <br />fusing because unspecified amounts of water diverted from one division <br />to another, or one State to another, within the natural basin. are in- <br />eluded in the totals reported for export diversions. Colorado suggests <br />that s uch diversions within the natural bas in be exc luded from the Re- <br />port, or if included be designated "trans-division,"' or "trans-state" di- <br />versions. and be segregated and summarized separately from "export diver- <br />sions," which term is applicable to and should be reserved for the waters <br />diverted from the Colorado River system for use outside the natural basin. <br />
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