9603

• UCREFRP Catalog Number: 9603
• Author: Clayton, R. and A. Gilmore.
• Title: Flaming Gorge Environmental Impact Statement Hydrologic Modeling Study Report - Results of Action and No Action Alternative Analysis.
• USFW Year: 2001.
• USFW - Doc Type: \
• Copyright Material: NO

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10
FIGURE 3 50th Percentile Elevations from Januar 2002 to December 2011

Flaming Gorge Elevation
50th Percentile

6040

6030

-::;- 6020 .. ..'
~
c
.2 . .
<::i
> .. ,
.., ..
G:i 60 I 0
All 50%i1e
6000 All - I 500/0i Ie
No Action 500/0ile
All Trace 16
5990
01-2002 01-2004 01-2006 01-2008 01-2010 01-2012
Year

Figure 4 shows another example of how achieving the 18,600 cfs objective had a
significant impact to the reservoir elevation of the Action(ALL) results. In this trace (trace 16)
there are 5 years where the Yampa River flows during the spring were high and triggered the
Action(ALL) ruleset to attempt to achieve the 18,600 cfs objective. These years were 2002,
2003,2004,2008, and 2010. Because of the increased peak releases that occurred in these years
for the Action(ALL) model run, the reservoir elevation remained substantially lower than the
Action(ALL-l) model run for most of the 10 year period shown in the figure. The elevation fully
recovered in 2009 by was then depressed in 2010 when the Action(ALL) ruleset was again
triggered to achieve the 18,600 cfs objective.