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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1 '7
Flow Durations (May - July)
Reach 2
- --
50000 __ I - - No Action 4 Week Flow
- Historic 4 Week Flow (71 -91 )
40000 - Action 4 Week Flow
_ 10000 -
'l.
J
i X0000
10000
0
0 17c-- -----20c7, - 4017c -- --- 60`o 100`/r
Percent Exceeded
Reach Two Base Flow Release Results
Figure 19 shows the distribution of baseflows that occurred in reach Two under the Action
and No Action alternatives. Baseflows are noticeably decreased under the Action alternative
especially in wetter years. For reference, the distribution of pre-dam (1946 to 1961) baseflows
and the distribution of baseflows during the period from 1971 through 1991 are included in the
figure. The period from 1946 through 1961 does include a significant dry cycle for the Upper
Green River Basin but these two distributions of historic Reach Two flows give some perspective
to the difference between the Action and No Action alternative baseflows.
Figure 19 Exceedance Percentage Flows for Reach Two Flows During Base Flow Period