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Trial 7 consisted of using the target contents supplied by Randy <br />and reoperating the model. This operation worked well and copies <br />were provided to Randy for review. Using this setup, the power <br />plant parameters were adjusted and general fine tuning was <br />accomplished. <br />Trial 8 consisted of operating the model for the 1930 to 1982 <br />period and comparing the results with the shorter period. Again, <br />the results were reasonable and provided a basis for other <br />simulations. ' <br />The next step was to use the model to do some of the "what if" <br />problems alluded to before. The particular problem addressed was <br />a proposal by the Service to constrain releases from Flaming Gorge <br />in the months of August and September to improve habitat <br />conditions for Colorado Squawfish fry. Releases would be <br />constrained to a maximum of 100,000 acre-feet per month and would <br />vary between 800 and 2600 cfs on a daily basis. The problem was <br />complicated by the assumption that these releases would not be <br />constrained in either wet or dry water years (below the 25 <br />percentile or above the 75 percentile). <br />Trial 9 attempted to simulate the conditions described above by <br />adding a channel constraint table at the station downstream of <br />Flaming Gorge Reservoir. The result was that in the months of <br />August through November, the Reservoir filled above the target and <br />sooner or later spilled, if inflow was excessive. In years when <br />the Reservoir did not spill, the releases in October and November <br />were increased to compensate for reduced releases in August and <br />September. <br />This problem was overcome by developing a modified target content <br />table which allows the Reservoir to increase in volume in August, <br />September, and October to compensate for the constrained releases <br />and to prevent spills. The target is then steeped down in <br />November, December, and January to equal the targets provided by <br />Randy in February. <br />Trial 10 consisted of using the constrained releases and the <br />modified target contents table to simulate the controlled releases <br />described in Trial 8. The result was not representative of what <br />would occur in wet or dry years; releases were made in dry years <br />when logical project operation would have cut back releases. In <br />wet years releases were constrained in August and September <br />causing the Reservoir to prematurely fill and spill. <br />15