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Last modified
1/26/2010 4:34:48 PM
Creation date
4/11/2008 10:03:45 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.10.B
Description
1998 Annual Operating Plan
Basin
Colorado Mainstem
Author
USDOI/BOR
Title
1998 Annual Operating Plan for Colorado River Reservoirs
Water Supply Pro - Doc Type
Operating Principles/Plan
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<br />Lake Powell <br /> <br />The April through July unregulated inflow into Lake Powell in water year i 997 was 13,964 <br />MC.M (11.321 ~lAF) or 147 percent of average. Water year 1997 unregulated inflow was <br />20,057 ~1C:M (16.261 ~L>\F) or 139 percent of average. Lake Powell ended the water year <br />8 feet from full. <br /> <br />During March and April 1996, a test of the Beach/Habitat Building Flow was conducted from <br />Glen Canyon Dam. The teSt consisted of peak releases of 45,000 cfs which lasted 7 days, <br />preceded and followed by 4-day periods of low steady flows to allow photographic mapping and <br />monitoring of the canyon resources. Scientific understanding and results of this test were <br />presented in a symposium held April 8 - 10, 1997. <br /> <br />This test was implemented following discussions between the Department of the Interior, the <br />Basin States, and key scientists and researchers which resulted in a long term agreement for <br />managing spills from Glen Canyon Dam. This agreement provides for the use of reservoir <br />releases in excess of power plant capacity required for dam safety purposes during high reservoir <br />conditions to accomplish the objectives of the Beach/Habitat Building Flow described in the <br />Record of Decision for the Glen Canyon Dam Final EIS (GCDFEIS). Such releases would be <br />consistent with the 1956 Colorado River Storage Project Act, the 1968 Colorado River Basin <br />Project Act and the 1992 Grand Canyon Protection Act. Such releases would be managed to the <br />maximum extent possible to (1) protect river sediment storage downstream or (2) be released <br />in such a way as to reshape river topography, redeposit sediment and enhance aquatic habitat. <br />With current full reservoir system conditions, there is a possibility releases above powerplant <br />capacity will be necessary in 1998. Such releases would be made consistent with the 1956 <br />Colorado Ri\-er Storage Project Act, the 1968 Colorado River Basin Project Act, and the 1992 <br />Grand Canyon Protection Act. In accordance with the GCDFEIS and the Record of Decision, <br />Reclamation intends to reinstall the spillway gate extensions at Glen Canyon Dam to increase <br />the flexibilitv of manal!inl! hi I!h runoff Years. <br />.' - - - ..; <br /> <br />During water year 1998, releases greater than the minimum release objective of 10,152 MC~1 <br />(8.230 ~1AF) likely will be made to avoid anticipated spills and/or to equalize the storage <br />between Lakes Powell and Mead. Under the most probable inflow conditions, releases of 13,260 <br />:MCM (10. 750 ~L>\F) would be made, while under the probable maximum inflow scenario, <br />approximately 21,759 ~IC~1 (17.640 NL.\F) will be released. This maximum probable inflow <br />would require releases of about 708 cms (25,000 cfs) for a lengthy period oftime. <br /> <br />The interim flow restrictions on the daily and hourly releases from Glen Canyon Dam <br />implemented in August, 1991 were replaced during water year 1997 by the parameters of the <br />Record of Decision for the GCDFEIS preferred alternative. Operating criteria and a plan of <br />operations were issued on February 24, 1997, in accordance with the 1992 Grand Canyon <br />Protection Act. A monitoring and research program has been implemented and will continue <br />to measure the effect of operating criteria on downstream resources as part of the Adaptive <br />Management Prol!ram. Releases from Lake Powell in water year 1998 will continue to reflect <br />~ - ..; <br /> <br />September 3, 1997 <br /> <br />11 <br />
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