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Last modified
8/11/2009 11:39:08 AM
Creation date
9/30/2006 10:01:45 PM
Metadata
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Publications
Year
1992
Title
An Analysis of Water Salvage Issues in Colorado and Irrigation Water Salvage Issues in the Grand Valley
CWCB Section
Water Conservation & Drought Planning
Author
CWCB
Description
Report on opportunities to produce "salvaged" water, etc.
Publications - Doc Type
Tech Report
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<br />V. Grand Valley Project <br /> <br />The Grand Valley Project was built by the Bureau between 1912 and 1917 and is <br />operated by the Grand Valley Water Users Association (GVWUA), Orchard Mesa <br />Irrigation District (OMID), Palisade Irrigation District (PID), and the Mesa County <br />Irrigation District (MCID). USBRretains a key role in the functioning of this project. As <br />a federal entity USBR has its own responsibilities under the Endangered Species Act, which <br />it is currently addressing by participation in the endangered fish recovery program. USBR <br />has looked at ways that the Grand Valley project and other projects it is involved in can <br />lessen impacts on critical habitat and be operated to augment flows in the "15-Mile Reach". <br />Draft Report, July, 1990: Study of Alternative Water Supplies for Endangered Fishes in the <br />"15-Mile Reach" of the Colorado River. <br /> <br />During operations studies of the Grand Valley Project, the USBR has identified <br />several feasible measures which can reduce irrigation headgate diversions without impairing <br />crop deliveries. USBR believes it would be possible to structurally improve the Government <br />Highline Canal by installation of automated level control gates ("checks") so that <br />administrative spills from the system could be reduced. Currently the canal must be kept <br />full of water throughout its 55 mile length to provide a sufficient volume and height of water <br />to all delivery points. When irrigation demands are less than anticipated, canal water is <br />spilled or "wasted" back to the river. At certain times this spilled water has been called past <br />upstream juniors. It is also not available to the reach of critical habitat between the canal <br />headgate and the waste discharge point. USBR estimates that some 60,000 AF is spilled <br />annually and preliminary indications are that 60% of these spills could be avoided with <br />improved facilities and management techniques. On this basis USBR estimates 36,000 AF <br />per year of saved water potential from operational changes in the Government Highline <br />System. These estimates are based on a very preliminary analysis of operational changes <br />in the system and water users do not necessarily agree with these estimates. <br /> <br />VI. Disposition of "Salvage" Water Produced in the Grand Valley <br /> <br />Water salvaged (no longer consumed) or saved (no longer diverted), if any proves <br />to be physically available, could be allocated to various water users pursuant to the following <br />scenarios, depending on how legal and policy issues are resolved. <br /> <br />Under existing state law and the Salinity Control Act there is no barrier to the <br />original appropriator using saved or salvaged water to make up current shortfalls in their <br />own supply, provided no additional irrigated acres are added. Despite the seniority of the <br />Cameo call there are indications that shortfalls do exist during peak irrigation periods in the <br />Grand Valley. This occurs despite the fact that the full decreed amount is being diverted, <br />because that rate is not large enough to provide for all the deliveries that may be required <br />at a particular moment. Belter scheduling and rotating demands may alleviate this situation. <br />Current information indicates that a major portion of the water previously lost to seepage <br />may continue to be diverted to meet short term peak irrigation demands, unless ditch <br />systems become able to better schedule and meet demands. <br /> <br />6 <br />
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