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WSP12928
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Last modified
1/26/2010 4:34:14 PM
Creation date
3/25/2008 2:52:07 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.40
Description
2003 Annual Operating Plan
Basin
Colorado Mainstem
Author
Lower Colorado Region River Operations Group
Title
2003 Annual Operating Plan Reservoir Information Operation Study
Water Supply Pro - Doc Type
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<br />e <br /> <br />e <br /> <br />Total unregulated inflow into Lake Powell in water years 2000 and 2001 was 62 and 59 percent of <br />average, respectively, and only 25 percent of average in 2002. Inflow in 2002 was the lowest ever <br />observed since the completion of Glen Canyon Dam in 1963. These low inflows have reduced <br />water storaQ:e in Lake Powell. Lake Powell reached a low water surface elevation this vear of 3605 <br />~ . <br />feet (95 feet from full pool) on yfay L 2003. The current elevation of Lake Powell is 3,609 feet (91 <br />feet from full pool). Current storage is approximately 12.7 million acre-feet (52 percent of capacity). <br />The ,\yater surface elevation at Lake Powell should continue to increase in June. However, there wiII <br />not be a large rebound in water storage this year with projected inflow being so low. Under the <br />current inflow forecast, Lake Powell will reach a peak water surface elevation of about 3,615 feet <br />this year. in late June or early July. <br /> <br />Experimental Flows: Daily high fluctuating releases from Glen Canyon Dam, as part of the Glen <br />Canyon Dam experimental flows, were completed on March 31, 2003. From January through <br />March 2003 releases ranged bet\:veen a high of20,000 cfs to a low of 5,000 cfs each day. These <br />same high fluctuating releases are scheduled to be repeated in January through March of2004. <br /> <br />The January through March high fluctuating releases were intended to benefit the endangered <br />humpback chub. Scientists have recognized that the humpback chub population has been in general <br />decline since highly fluctuating flo'\vs '\vere curtailed in November of 1991. Those flows helped <br />keep the non-native fish, especially the rainbow and brown trout, in check. The trout are thought to <br />prey upon and compete with native fish such as the endangered humpback chub. <br /> <br />The experimental flows from Glen Canyon Dam received environmental clearances in December <br />2002. The flo'\'\-s were analyzed in an environmental assessment in accordance with the National <br />Environmental Policy Act. The experimental flows are the result of ongoing studies by scientists <br />from the United States Geological Survey and were recommended by the Glen Canyon Dam <br />Adaptive Ylanagement Work Group, a Federal advisory committee. The experimental flows address <br />the decline of1"\'\-o key resources in the Grand Canyon: sediment and population viability of <br />endangered humpback chub. The Finding of 1"0 Significant Impact on the experimental flows can <br />be found at http://m,nv.uc.usbr.gov/ampfflow_tonsi.pdf. <br />
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