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I 11 I I I !I II I I I 1 I I I I I I I I I CHAPTER V - OPERATION STUDIES Basic Approach In previous chapters, the project demands were determined, the hydrologic characteristics of the basin were defined, and three alternative plans were selected for final evaluation. The first activity in this final evaluation is the simulated operation of the diversion, storage, and distribution facilities for each alternative. This analysis is needed to properly size and locate these facilities in order to meet project demands. Simulation Program Operation studies basically consist of a water accounting system that simulates the manner in which the project can be operated within the limits of water rights, water supply, and water demands. There are a number of comprehensive river basin models available. However, due to the relatively small size of the Upper White River Basin, the limited data base available, and the appraisal level of the study, it was determined that a site-specific program would be most appropriate. A computerized program was prepared to simulate the Upper White River Basin and to evaluate the alternative projects. Basic Methodology There are two primary factors which influence the operation of the system. These are: 1) the streamflow characteristics at key locations and 2) the priority and location of the YJWCD water rights in relation to senior rights on the river. The three alternative plans consist of diversion and storage facilities in locations other than those listed in the original YJWCD water right decree. This will require a change in the point of diversion for these rights, and under Colorado water law, this change in right must be adjudicated. The operation of a water right from an alternate point of diversion must be such that it will leave other rights in the same status as they would have been had the original diversion point been used. For this reason, the allowable Vol