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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FIGURE 6 Trace 5 Elevation Com arison

13

6040
c::
0
; 6030
lI:l
>
C1l
iii
C1l
(J 6020
~
:::l
tn
l-
C1l 6010
-;
~
6000

Trace Comparison
Action(ALL)/Action(ALL-1 )/NoAction Trace 5

6050

- Action(ALL)
- Action(AL L-1)
- NoAction

5990
Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 Jan-12

Date

During the early spring, the elevation of Flaming Gorge Reservoir is normally at its
lowest level of the year. Figures 7 and 8 show the number of occurrences when the elevations at
the end of April are within particular ranges. Figure 7 shows a comparison between the Action
(ALL-I) and the No Action model output. Figure 8 shows a comparison between the Action
(ALL) and the No Action model output. Comparison between Figure 7 and Figure 8 shows that
achieving the 18,600 cfs objective had the effect of increasing the occurrences of lower
elevations in the spring. The number of occurrences when elevations at the end of April were
below 6000 feet above sea level increased from less than 50 (2% of the time) in the
Action(ALL-l) model run to nearly 300 (12% of the time) in the Action(ALL) model run. There
were no occurrences in the No Action results where the elevations at the end of April fell below
6000 feet.