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 4 Trace 16 Elevation Com arison

11

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Trace Comparison
Action(ALL)/Action(ALL-1 )/NoAction Trace 16

6050

6040

- Action(ALL)
-Action(ALL-1)
- NoAction

6000

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

Date

Figure 5 shows the 10th percentile reservoir elevations for the first 10 years of each model
run. These elevations were exceeded 90% of the time but were equal or lower than these levels
10% of the time. The Action (ALL) results show a significant impact to the reservoir elevation
as a result of the 18,600 cfs objective. Reservoir elevations for the Action(ALL) results
decreased substantially over the first 10 years then stabilized below 6000 feet above sea level for
the remainder of the model run. The results for the Action (ALL-I) model run indicated that
meeting all flow objectives except for the 18,600 cfs objective did not significantly impact the
reservoir elevation through time. An example trace(trace 5) has been included in Figure 5 which
shows how the reservoir elevation tracked for the Action(ALL) model run. The elevation for
this trace of the Action(ALL) model run achieved the 10th percentile value in July, 10 years into
the trace.