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Last modified
7/14/2009 5:02:37 PM
Creation date
5/20/2009 3:26:40 PM
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UCREFRP
UCREFRP Catalog Number
9631
Author
U.S. Bureau of Reclamation.
Title
Operation of Flaming Gorge Dam Draft Environmental Impact Statement Executive Summary.
USFW Year
2004.
USFW - Doc Type
Salt Lake City, UT.
Copyright Material
NO
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After September 15, releases from Flaming Gorge Dam could be increased so that the <br />daily average flow measured at Jensen, Utah, would achieve a target ranging from 1,100 <br />to 2,400 cfs while controlling the reservoir elevation within safe operating levels. <br />During the early base flow period (through the month of October), fluctuating releases for <br />power production likely would occur. These fluctuating releases would be limited so that <br />the hourly flow of the Green River, measured at Jensen, Utah, would be maintained at <br />±12.5% of the daily average flow of the Green River (measured at Jensen, Utah).' <br />S.13.2.4 Winter Operations (Late Base Flow Period) <br />There are no specific flow recommendations provided by the 1992 Biological Opinion for <br />the period from November to May. Beginning November 1, the 1992 Biological Opinion <br />calls for releases to be low and stable near historic levels. Under the No Action <br />Alternative, Flaming Gorge daily average releases from November through May <br />potentially could range from 800 cfs to powerplant capacity (about 4,600 cfs). However, <br />it is anticipated that in most years, releases during this period would range from 800 cfs <br />to about 3,000 cfs. Releases from Flaming Gorge Dam during the late base flow period <br />would be designed to reduce the reservoir elevation to maintain safe reservoir operations. <br />Under the No Action Alternative, releases would achieve an upper limit drawdown <br />elevation on March 1 of 6027 feet above sea level. The upper limit drawdown elevations <br />for May 1 under the No Action Alternative are the same as those under the Action <br />Alternative. <br />During the late base flow period, fluctuating releases for power production could likely <br />occur. The Reasonable and Prudent Alternative of the 1992 Biological Opinion does not <br />specifically limit fluctuating releases during the late base flow period. Under the No <br />Action Alternative, however, fluctuating releases would be limited, similar to the early <br />base flow period, as they have been historically. The hourly flow of the Green River <br />measured at Jensen, Utah, would be maintained from ±12.5% of the daily average flow <br />measured at Jensen, Utah. <br />S.13.3 Reservoir Operations Process Under the Action Alternative <br />In general, implementation of the 2000 Flow and Temperature Recommendations into the <br />operational plans for Flaming Gorge Dam would occur through coordination as described <br />on pages 5-8 of the 2000 Flow and Temperature Recommendations. A Technical <br />Working Group consisting of biologists and hydrologists involved with endangered fish <br />recovery issues would be convened by Reclamation at various times throughout the year. <br />Staff from Reclamation, Fish and Wildlife, and Western would be members of this group <br />as well as other qualified individuals who choose to participate on a voluntary basis. <br />Reclamation would present an initial operational plan with balanced consideration of all <br />resources associated with Flaming Gorge Reservoir and the Green River for comment <br />from the Technical Working Group. Reclamation would take into consideration the <br />information described in table S-4 and any new information that may be available to <br />' The daily average flow measured at Jensen, Utah, would be determined from the average of the <br />instantaneous flow readings during a 24-hour period from midnight to midnight each day. <br />S-22 za Operation of Flaming Gorge Dam Draft EIS
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