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WSP11413
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Last modified
1/26/2010 3:17:20 PM
Creation date
10/12/2006 4:57:05 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8443.600
Description
Narrows Unit - Studies
State
CO
Basin
South Platte
Water Division
1
Date
2/1/1963
Author
Bor,
Title
Site Selecion Presentation to the South Platte Steering Committee
Water Supply Pro - Doc Type
Report/Study
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<br />Wa;ter Utilization "Without Project" <br />, <br /> <br />Irrigation season-~ith an increased water supply in the <br />fUtur~ junior priority ditches will be able to more fUlly exercise <br />their existing water rights. Our studies assume that increased <br />diversions ,will first be used to eliminate shortages on lands <br />being irrigated today. If there should be an excess of water over <br />that necessary to eliminate historic shortages, diversions will be <br />made to presently cultivated dry lands under existing ditches or <br />ditch systems which will expand their irrigated acreage. Assuming <br />this service has been accomplished any remaining water would <br />replace that which had been pumped historically. By the same <br />token, however, if pumping capacity was increased under a ditch <br />or ditch system during the study period, there exists an opportunity <br />to increase pumping in years hydrologically similar to those <br />existing during the study period if shortages remain in the future. <br /> <br />Nonirrigation season--During the nonirrigation season water <br />could 'be diverted and stored in existing off-channel storage. Our, <br />historic studies show a large amount of unused storage capacity in <br />the basin. Increased nonirrigation season supplies in the future <br />were routed to this storage. <br /> <br />Water Utilization "With Project" <br /> <br />There were two differences between our historic and 1990 level <br />studies with a project; (1) reuse of participating ditch return flow <br />was computed on a monthly basis rather than an annual and, (2) one <br />additional alternate was studied. <br /> <br />Shortages in 1990 will be much less than those existing today. <br />Not only will shortages be reduced, they will be concentrated in a <br />short period during the irrigation season. Shortages for most <br />ditches will ,occur in only one or two months. Most existing off- <br />stream reservoirs will be fully utilizing their decreed capacities with <br />the increased flows occurring in the winter. All these factors make <br />it more difficult to utilize return flows even as efficiently as we do <br />today. For this reason the scope of studies analyzing reuse of <br />participating ditch return flow was, expanded from an annual to a <br />monthly basis. <br /> <br />Another difference was a study to ascertain the effects of <br />future upstream developments. By 1990 it is predicted that the basin <br />water supply and demand ,for that water will promote the development <br />of additional upper main stem valley and tributary regulatorY facilities. <br />Mr. Greer outlined one area of this potential earlier. A study was <br /> <br />27 <br /> <br />. <br /> <br />
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