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<br />002816 <br /> <br />- <br /> <br />DRAFT <br /> <br />e <br /> <br />method of operating Lakes Powell and Mead was developed. This model is <br /> <br />a small simplified model of the Colorado Basin designed to help develop <br />and revise the strategies before performing detailed evaluation using <br />CRSS. This model considers annual inflows and depletions, as well as <br /> <br />reservoir contents, simulated releases, and power generatfon from Lakes <br /> <br />Mead and Powell, for both the current (base case) and alternative <br />operating strategies. Results of these analyses were good but lacked <br /> <br />sufficient details regarding maximum monthly releases. <br /> <br />For this reason, a more detailed version of this model was developed <br />simulating monthly release patterns from Lakes Mead and Powell. This <br /> <br />model was run using a series of synthetic and historic hydrologic <br /> <br />traces. Results of analyses using this model showed that considerable <br /> <br />variation in monthly releases, power generation, and reservoir contents <br /> <br />could be expected from one strategy to another. <br /> <br />I <br /> <br />This model identified a number of feasible alternative operating strate- <br />gies. The feasible strategies chosen represented a wide range of <br />release levels which appeared to offer certain advantages with respect <br />to the parameters modeled by the small model. <br /> <br /> <br />The feaSlbl~peratlng strategleS~evaluated <br /> <br />using the CRSS ,Celerael& <br /> <br />~ <br /> <br />~iv2r ~imulation Systp~. The CRSS is a package of computer programs <br />that models the quantity and quality of flows throughout the Colorado <br /> <br />River Basin. The system models monthly flows, salinity concentrations, <br />diversions, ~return flows, reservoir operations, and power genera- <br />tion. The model incorporates surplus and shortage criteria, operating <br /> <br />v <br /> <br />6 <br />