WSP05167

• File Number: 8220.104.I
• Description: Flaming Gorge
• State: UT
• Basin: Yampa/White/Green
• Date: 10/1/2001
• Author: Clayton-Gilmore
• Title: Flaming Gorge Environmental Impact Statement Hydrologic Modeling Study Report
• Water Supply Pro - Doc Type: Report/Study

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elevations of the Action(ALL) model run. Reservoir elevations for the Action(ALL-l) model
run, on average, were three to four feet lower than the No Action model run results during the
summer month as compared to seven feet lower for the Action(ALL) results. Bypass releases
were significantly reduced from the Action(ALL) model results, The frequency of bypass
releases in the Action(ALL-l) model results was 38% while in the Action(ALL) model results
this frequency was 53%. The Action(ALL-l) model run achieved nearly all of the objectives of
the Action Alternative while dramatically reducing the impacts to the resource associated with
the authorization Flaming Gorge Reservoir.

The intent ofthis study has been to evaluate the relative differences between the Action
and No Action Alternatives proposed for the Flaming Gorge EIS, The modeling of the Green
River System and these alternatives is now at a point where these differences are evident. This
report provides hydrologic information for the purpose of determining the impacts to the
resources associated with Flaming Gorge Reservoir, If additional information is needed for this
purpose, it will be provided as needed.