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<br />U':.lu.:>JO <br /> <br />The Resident Power and Reservoir System Model (pRSYM) <br /> <br />· sediment oxygen demand, and <br />. multiple carbon and nitrogen biological oxygen demand (BOD) inflow loadings <br />and withdrawals, including upstream dam releases, tributary inflows, point and <br />nonpoint loadings, and dam outflows. <br /> <br />Additionally, the module shall be designed to allow expansion to consider nutrient <br />loadings and algal dynamics. <br /> <br />It is assumed that site-specific temperature and DO issues will be addressed by <br />separate, more detailed water quality models residing outside the DSS as non-resident <br />models. <br /> <br />Operating Construints and Policies <br /> <br />PRSYM must have a clear and precise method for the user to express system constraints and <br />operating policy, to modify these constraints, to add or delete constraints, and to prioritize <br />constraints. Modification of the constraint set should not require computer code changes, <br />provided that the appropriate constraint variables are accounted for within the model. <br />, <br /> <br />The model must support the expression of operational and policy constraints or targets (when <br />appropriate) in terins of: <br /> <br />· dam release (turbine or total) <br />· water surface elevation (or storage) <br />· changes in elevation (e.g. ,drawdown) <br />· hydropower generation <br />· generating capaCity <br />· turbine dischargeeapacity <br />· spill ' <br />· diversion (canal) flow <br />· energy-in-storage, <br /> <br />In order to capture the complexities of a large, operational reservoir system, PRSYM must <br />be capable of handling a variety of categories and types of constraints. Some general <br />categories of constraints include physical constraints (e.g., top-of-gate elevation, minimum <br />power generation elevation), operational constraints (e.g., maximum drawdown rate, <br />minimum generation targets), and constraints expressing multipurpose operating objectives <br />(e.g., flood guide levels during the flood season, target summer recreation elevations, <br />minimum flow releases for water quality). <br /> <br />PRSYM must be able to accommodate simple and complex types of constraints. Simple <br />constraints generally refer to well-defined constraints at specific project(s). These constraints <br />are generally elevation or release constraints, and often involve upper and lower bounds. <br />Some examples include a maximum dam release associated with the downstream channel <br /> <br />3-8 <br />