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C150221 Water Potential Report
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C150221 Water Potential Report
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Last modified
6/12/2014 4:51:05 PM
Creation date
2/19/2014 3:15:10 PM
Metadata
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Template:
Loan Projects
Contract/PO #
C150221
Contractor Name
San Luis Valley Irrigation District
Contract Type
Grant
Water District
20
County
Hinsdale
Loan Projects - Doc Type
Report
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Mr. Travis Smith, Superintendent <br /> October 16, 2003 <br /> Page 11 <br /> Company must divert Priorities No. 361-A and 361-B for 10 cumulative days or 8 consecutive <br /> days prior to the beginning of direct flow storage, must forego storage of 13 percent of the <br /> storable flow, and are subject to an 11 percent charge for conveyance losses when the water is <br /> released from storage. A maximum of 8,700 acre-feet may be stored per water year. <br /> Tables 8 and 9 show the additional water that would have been available to the Rio <br /> Grande Canal Water Users Association and Commonwealth Irrigation Company for direct flow <br /> storage during the 1946-2002 irrigation seasons. As shown in Table 8, the additional water <br /> available to the Rio Grande Canal Water Users averaged 23,297 acre-feet annually and ranged <br /> from none in 1977 2002 to 72,065 in 1965. In Table 9, the additional water available to the <br /> Commonwealth Irrigation Company averaged 4,433 acre-feet annually. Amounts ranged from <br /> none in four different years, most recently in 2002, to the maximum allowed of 8,700 acre-feet in <br /> eight years, with the most recent occurrence in 1995. <br /> CONCLUSIONS <br /> 1. We believe that storage in an enlargement of Rio Grande Reservoir under a post- <br /> compact water right would be limited to years when either Project Storage in Elephant <br /> Butte and Caballo Reservoirs spills or when Colorado achieves an annual credit of <br /> 150,000 acre-feet or more. Historically, during water years 1946-2002, Project Storage <br /> spilled in 1985, 1986, 1987, and 1995, and Colorado did not achieve an annual credit of <br /> 150,000 acre-feet or more. Consequently, water would have been available for storage <br /> in a post-compact reservoir only in 1985, 1986, 1987, and 1995 and the amounts, which <br /> are shown in Table 4, ranged from 30,850 acre-feet in 1995 to 73,082 acre-feet in 1985. <br /> 2. We believe there would be benefits to Colorado and the Rio Grande water users in <br /> having additional reservoir capacity available for storage of "Compact water". <br /> Specifically, we believe additional reservoir capacity would facilitate storage of Compact <br /> water to reduce changes in curtailments during the course of the irrigation season, the <br /> storage of Compact water during years of high flow to reduce the losses delivering the <br /> Compact water to the State Line, and storage of Rio Grande credit water, which would <br /> reduce evaporation losses and eliminate the chance of spill from Project Storage. <br />
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