9602

• 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: \
• Copyright Material: NO

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I5
Base Flows - Reach One
August through Fehuary
------
5000

4000

000

u.,
?000

1000
40,4 60cT,
Percent.we Etceedance
Reach Two Spring Peak Flow Results
Figures 16, 17 and 18 show the distributions of modeled spring peak flows that occurred in
Reach Two. Figure 16 shows the distribution of peak flows having a duration of one day while
Figure 17 and 18 show distributions for peak flows having durations of two and four weeks,
respectively. For perspective, the historic peak flows during the period from 1971 though 1991
are included on each of these figures. While the distributions of the Action and No Action peak
flows are similar, there are notable differences at specific percentage exceedances. This is
evident in Figure 16 where the distribution for the Action alternative noticeably deviates from the
No Action alternative at about 13% exceedance. Similar deviations occur in the Action alternative
at 10% and 40% exceedance levels for the two week duration peak flows. In the four week
duration peak flows, a deviation in the Action distribution occurs at about 10% exceedance. All of
these deviations indicate where peak flows were increased by the Action alternative in order to
achieve the specific targets of the 2000 Flow Recommendations.
Figure 16 Distribution of Peak Flows (One Day Duration) in Reach Two
- No Action
- Action
- Historical (71-91 )
- FG linre?* (71-91 )