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<br />. -, ~"' l <br />(j D u .j,) he Resident Power and Reservoir System Model (PRSYM) <br /> <br />· flow <br />· water surface elevation <br />· water temperature <br />· dissolved oxygen <br /> <br />The simulation module must also be capable of computing system status information, . <br />including: <br /> <br />· system storage <br />· available flood control storage <br />· system energy-in-storage <br /> <br />These system parameters should be available for the entire syst~m or above a user_~s~ifi~ <br />location. <br /> <br />Encrnaclllllents on critical constraints or violation of specified thresholds should be flagged in <br />me model output. <br /> <br />The display and analysis of model output is discussed in more detail in the subsequent section <br />on Analysis Tools (Section 5). <br /> <br />The user should be able to specify the units of the input and output data in either English or <br />the International System .of units. . <br /> <br />Model Environment and Software Requirements <br /> <br />Generic and Portable <br /> <br />Since PRSYM will serve the needs of a variety of utilities, a fundamental requirement of the <br />modeling environment is that it be easily ported from one river basin to another and that it be <br />easily modified to accommodate utility-specific issues. These requirements would best be <br />served by a model that is data-centered, modular, and extensible. <br /> <br />Data-Centered <br /> <br />PRSYM should be a data-centered model. That is, it should simulate behavior in a particular <br />reservoir system by virtue of the data that is supplied for that system. Another system could <br />then be modeled by supplying a new set of data. The user should be able to easily modify <br />data for any part of the system. <br /> <br />3-12 <br /> <br />.- <br />