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G028d4 e e 'lo 1984 Colorado River Operations Study Status Report August 24, 1984 Item 1 - Preparing the Hydrology, Depletion, and System Characteristics Data Completed. Item 1 consisted of updating the CRSS hydrology data base through 1983, creating additional synthetic hydrology data bases, updating and making corrections to the depletion data base, and updating system characteristics and modeling routines. This latter item included changes to forecast values, the powerplant simulation routine, area-capacity values to include sediment, starting conditions, the 602(a) storage routine, and addition of Taylor Park Reservoi r. Item 2 - Developing a Method of Characterizing Each Strategy Completed. Item 2 consisted of developing a method of operating the system that would yield a number of alternative operating strategies. Each alternative operating strategy is characterized by the probability of not having to make flood control releases. The method developed calculates planned releases from Lakes Powell and Mead in order to avoid flood control releases. Item 3 - Defining Feasible Alternative Operating Strategies Completed. Item 3 consisted of developing a basic simulation model containing the method of operating the system developed in item 2. This small model was used to identify a number of feasible alternative operating strategies that would be evaluated by the large CRSM (Colorado River Simulation MOdel). The feasible strategies chosen represent a wide range of release levels which appeared to offer some advantages with respect to the parameters modeled by the small model (releases, end of study contents, power generation, etc.). Item 4 - Developing a System for Evaluating Strategies Completed. The first part of item 4 was the development of computer code for the CRSM that would model the method of operating the system developed in items 2 and 3. The second part of thi s item was the development of a system for evaluating the feasible alternative operating strategies. The system developed consists of imposing two different depletion schedules and 17 different hydrologic sequences on four alternative strategies and one base case strategy. The third part of this item was the indentification of parameters that need to be output and development of computer programs to output the tables and plots that will display the parameters in the final report.