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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23
included in the figure. The historic flows show how Flaming Gorge Dam operations prior to the
1992 Biological Opinion, effected the distribution of flows in Reach One during the base flow
period. Releases prior to 1992 were elevated above natural levels to produce power. The
historic unregulated flows for the same period indicate how the distribution of flows in Reach
One might have been if Flaming Gorge Dam did not regulate the flow of the river.

FIGURE 19 Exceedance Percenta e Flows for Reach One Flows Durin Base Flow Period

Base Flows - Reach One
August through Febuary

5000

4000

No Action
All - 1
All
Historical (71-91)
FG Unreg (71-91)

3000
---
~
2-
:l:
0
u:
2000

1000

o
0%

20%

40% 60%
Percentage Exceedance

80%

1 00%

Reach Two Spring Peak Release Results

The model accounts for flows in Reach Two by adding the flows from the Yampa River
to the flows from Reach One. The estimated flows at all points along Reach Two were assumed
to be equal to the release rate from Flaming Gorge Dam plus the flows on the Yampa River. The
Green River model lagged Flaming Gorge Dam releases by one day to account for travel time
through Reach One.