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Lower South Platte River Study
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Last modified
11/20/2015 10:59:50 AM
Creation date
11/20/2015 10:58:59 AM
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Loan Projects
Contractor Name
Colorado Water Conservation Board
Loan Projects - Doc Type
Feasibility Study
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ILower South Platte River Study <br /> Colorado Water Conservation Board <br /> IDecember 2001 <br /> 2.4 Water Available for Diversion and Storage <br /> IThe NCWCD completed an extensive analysis of water availability in the Lower South Platte <br /> River from the diversion for the North Sterling Inlet Canal to the Julesburg Gage. The <br /> Ianalysis is in the form of an Excel spreadsheet and covers water years 1943 through 1997 (55 <br /> years; 660 months). Results from that analysis were made available to the study team in <br /> February 2001. After reviewing the methods, assumptions, and results, the study team <br /> Iconcluded that NCWCD's analysis provides a reasonable and reliable prediction of water <br /> available at selected locations. The spreadsheet is suitable for evaluating potential water <br /> I management strategies. However, refinements in the use of the data will be required for the <br /> feasibility phase of study. These refinements would include: further definition of seepage <br /> and evaporation losses during periods when water is being conveyed to or released from <br /> Istorage; evaluation of the potential for direct releases from storage to the river to benefit <br /> aquatic habitat; and assessment of how considering daily vs. monthly flows could affect the <br /> Iestimated water supply made available from a new storage project. <br /> A key element of the spreadsheet model is the"point-flow analysis" completed by the U.S. <br /> I Bureau of Reclamation. The spreadsheet has an option to consider water availability only <br /> during months of surplus with respect to USFWS target flows in the critical habitat reach of <br /> the Platte River in central Nebraska. <br /> IResults of the spreadsheet model are provided below, assuming that water only would be <br /> available when there is a surplus with respect to USFWS target flows. Detailed results of <br /> Iwater availability analyses are provided in Appendix A. <br /> I Location Maximum Available Water(Acre-Feet)t" <br /> Minimum Average <br /> Month Year Month Year Year <br /> I No. Sterling Inlet Canal t'I 692,000 1,626,000 0 0 164,100 <br /> Harmony Ditch(2)(3) 708,000 1,703,000 0 0 192,200 <br /> Peterson Ditch(3) 713,000 1,722,000 0 0 198,100 <br /> Julesburg Gage 717,000 1,740,000 0 0 205,000 <br /> (1) Water only available when there is surplus to USFWS target flows. <br /> I (2) Inlet canal for Julesburg Reservoir. <br /> (3)See Tables 2-1 through 2-3 for monthly data. <br /> I While water supplies appear to be abundant on an average annual basis as indicated in Tables <br /> 2-1 through 2-3, there are extended periods of months when no water is available for <br /> withdrawal under a junior water right. These are drought periods, the most severe which are: <br /> I <br /> I <br /> GEI Consultants, Inc. 2-5 01002 Dec 2001 Lower South Platte River Study <br />
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