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Western Proposed Peaking Flexibility Test Initial flow Increased Flow Duration Ending Number at F Gorge CFS to CFS Hours Flow CFS 1 2,600 4,200 3 2,600 2 2,600 4,200 4 2,600 3 2,600 4,200 5 2,600 4 2,600 4,750 1 2,600 5 2,600 4,750 2 2,600 6 2,600 4,750 3 2,600 7 2,600 4,750 4 2,600 The results of the SSARR runs requested by Western are presented in Tables 5-3 through 5-6. The tables present peak flows, and associated change in stage and flow at Mitten Park, Jensen, Ouray and Tia Juana Bottom. As can be expected, the greatest fluctuation in stage was at Mitten Park, which is the most upstream gage evaluated and is situated in a narrow canyon where stage changes are the most noticeable. Changes at the Ouray refuge site are less dramatic but are significant, ranging from a third to two thirds of a foot. The meaning of these changes will have to be evaluated by the biologists to ascertain their effects on endangered fish habitat. 5.6 Summary The calibration and validation of the SSARR model for the Green River from Flaming Gorge Reservoir to Tia Juana Bottom has been accomplished in several phases. Reclamation was responsible for the calibration from Flaming Gorge to Jensen, Utah. The Service was responsible for the calibration from Jensen to Tia Juana Bottom. The work accomplished by Reclamation concentrated on aligning the peaks in terms of timing and magnitude. Subsequent work by Reclamation and the Service has refined this calibration to produce accurate results over the full range of the daily Hydrograph. Building on past calibration work the Service was able to calibrate the model so that peaks aligned within 1 hour at Mitten Park and Jensen and the differences between simulated and recorded flows were within 4-8 percent. Based upon these observations, calibration should be considered good at Mitten Park and Jensen. During October 1987, Reclamation conducted a field test of the model down to Jensen, Utah. 5-6