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Last modified
7/14/2009 5:02:36 PM
Creation date
5/24/2009 7:24:46 AM
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UCREFRP
UCREFRP Catalog Number
9602
Author
Clayton, R. and A. Gilmore.
Title
Flaming Gorge Draft Environmental Impact Statement Hydrologic Modeling Report.
USFW Year
2002.
USFW - Doc Type
\
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3 <br />6027 feet above sea level to provide space in the reservoir to absorb the above average inflow. <br />Conversely, in years where the early indications are that the spring is going to be dry, the reservoir <br />is typically drawn down to a target higher than 6027 so the reservoir has a better chance of filling <br />despite the dry conditions. This flexibility has now been incorporated into the Flaming Gorge <br />model. In anticipated wet years, the drawdown target is now set to 6025 feet above sea level and <br />in anticipated dry years, the drawdown target is set to 6029 feet above sea level. <br />Model Results <br />Flow Recommendations <br />Table 1 shows the current state of the Action and No Action alternatives in terms of how <br />well each alternative achieves the specific recommendations of the 2000 Flow Recommendations <br />during the spring in Reaches One and Two. While the No Action alternative does not attempt to <br />meet any of these targets, a comparison between the Action and No Action results does indicate <br />some of the key differences between the operational regimes. <br />TART.F. 1 7.(1M Flnw RPrnmmPnrlatinnc TaraPt Flnw.c_ ilnratinnc and FrenllenCleS <br />Spring Peak Flow Reach Target % Action No Action <br />Recommendations Ruleset Ruleset <br />Peak >= 26,400 cfs 2 10 % 11.3% 7.1% <br />For at least 1 da <br />Peak >= 22,700 cfs 2 10 % 10.7% 4.6% <br />For at least 2 weeks. <br />Peak >= 18,600 cfs 2 10 % 1 l.l% 6.0% <br />For at least 4 weeks. <br />Peak >= 20,300 cfs <br />2 <br />30 % <br />46.3% <br />42.3% <br />For at least 1 da . <br />Peak >= 18,600 cfs 2 40 % 41.1% 15.6% <br />For at least 2 weeks. <br />Peak >= 18,600 cfs 2 50 % 60.3% 59.1% <br />for at least 1 day. <br />Peak >= 8,300 cfs 2 100 % 100% 98.5% <br />for at least 1 da . <br />Peak >= 8,300 cfs 2 90 % 96.8% 96.9% <br />for at least 1 week. <br />Peak >= 8,300 cfs <br />for at least 2 days except 2 98 % 99.6% 98.4% <br />in extreme dr ears. <br />Peak >= 8,600 cfs 1 10% 30.2% 6.5% <br />for at least 1 da . <br />Peak >= 4,600 cfs 1 100% 100% 100% <br />for at least 1 da . <br />Reservoir Wet and Dry Cycle Results <br />
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