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WSP05167
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Last modified
1/26/2010 2:17:15 PM
Creation date
10/12/2006 12:53:45 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.104.I
Description
Flaming Gorge
State
UT
Basin
Yampa/White/Green
Date
10/1/2001
Author
Clayton-Gilmore
Title
Flaming Gorge Environmental Impact Statement Hydrologic Modeling Study Report
Water Supply Pro - Doc Type
Report/Study
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<br />8 <br />FIGURE 1 90tb Percentile Elevations from Januar 2002 to December 2011 <br /> <br />Flaming Gorge Elevation <br /> <br />90th Percentile <br /> <br /> <br />Z 6020 <br />~ <br />c <br />o <br />'= <br />.. <br />> <br />" <br />fii 6010 <br /> <br />". .., <br /> <br />6000 <br /> <br />All 9O%ile <br />All - 1 90%ile <br />-e- No Action 90%ile <br />All Trace 54 <br /> <br />5990 <br />01-2002 <br /> <br />01-2004 <br /> <br />01-2006 <br /> <br />01-2008 <br /> <br />01-2010 <br /> <br />01-2012 <br /> <br />Year <br /> <br />To illustrate an example of the impacts that achieving the 18,600 cfs objective had on the <br />reservoir elevation, Figure 2 shows trace 54 results for all three model runs during the fIrst 10 <br />years, Five of the 10 years shown in the fIgure triggered the Action(ALL) ruleset to achieve <br />18,600 cfs objective because of high flows experienced on the Yampa River. The years when <br />Action(ALL) ru1eset was triggered were 2002, 2006, 2008, 2010, and 201 L In these years, the <br />peak release from Flaming Gorge Dam was increased (if necessary) to the threshold level <br />necessary to achieve 18,600 cfs in similar years (in some years this meant increasing to 8600 cfs <br />and other years to 10,600 cfs), In all years except 2011 the peak release was increased by the <br />Action(ALL) ruleset above the peak release that was calculated for the Action(ALL-1) ruleset. In <br />2011, the release rate estimated in both the Action(ALL) and the Action(ALL-1) rulesets was <br />high enough to achieve the 18,600 cfs objective, The hydrology for the Upper Green River Basin <br />during the spring of 20 11 was very wet and releases during that year were hydrologically driven <br />to control the reservoir elevation and not by the flow objectives of the proposed alternative, The <br />increased releases are evident by the sharp drops in elevation that occurred in the spring of each <br />of the years mentioned above, <br />
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