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<br />\)'\\ U '2, \\.'6 <br /> <br />starting from current operating conditions. For planning purposes, PRSYM will also support <br />multi-year evaluations. PRSYM will initially include a simulation module, but will be <br />designed to incorporate an optimization module in the future. <br /> <br />The simulation module of PRSYM must be capable of simulating the behavior of a large, <br />complex multipurpose reservoir system subject to system constraints and objectives. The <br />model will include capabilities for: routing, a graduated time step (daily, weekly, monthly), <br />subsystem analysis, computation of hydropower generation at varying operating modes, and <br />bulk water quality (temperature and DO) modeling. PRSYM will include a method to <br />express, modify, add/delete, and prioritize system constraints and operating policy without <br />code modifications. PRSYM must also include a procedure for estimating the value of water <br />in storage, including the value of hydropower over time in relationship to the overall power <br />system. <br /> <br />Once system constraints have been satisfied, there may still exist a range of feasible solutions <br />or operating plans. PRSYM will include a simplified method for selecting an 'operationally <br />acceptable' schedule within the available zone of flexibility. For example, the model could <br />minimize deviations from guide curves while maintaining balanced pool operations. <br />Alternatively, to address power economics, the model could attempt to meet economic hydro <br />generation targets or weights which reflect forecasted power system conditions. <br /> <br />To serve the needs of a variety of utilities, the PRSYM model must be easily ported from <br />one river basin to another and easily modified to accommodate utility-specific issues. The <br />object-oriented software/modeling approach supports this need for a modeling environment <br />that is data-centered, modular, and extensible. <br /> <br />The PRSYM user-interface must provide capabilities to easily create (or modify) and <br />graphically express the reservoir system network, to manipulate objects within the network, <br />and to display and edit input data (including constraints) and output data. The PRSYM <br />interface will be called from the model menu of the DSS and will have an overall screen <br />design similar to that of the DSS user-interface. <br /> <br />The PRSYM mOdel will interact directly with the DSS database and will have access to rea1- <br />time conditions, such as current reservoir elevations and the forecasted generation schedule, <br />to define initial simulation conditions. Certain defined outputs from PRSYM will also be <br />saved in the DSS database for access as input to other models or analysis tools. PRSYM <br />must also have access to hydrologic time series from several non-resident sources such as a <br />generic hydrologic modeling framework, utility-specific operational hydrologic modeling <br />systems, and historical data files. <br /> <br />Model testing is required throughout the development and implementation stages of PRSYM. <br />The testing will include verification of the accuracy of model algorithms, as well as <br />calibration and validation of the model on the TV A system. The quality and performance of <br /> <br />S-2 <br />