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O 1 ~', i 8 '. UUV.L The Integral Project and the integration of modeling capabilities. The development of the DSS and the modeling system, therefore, will proceed in parallel. To provide the flexibility to address the modeling needs of a wide variety of utilities and water resources agencies, the modeling system will be divided into three main categories: · Resident models, . Non-resident models, and · Analysis tools. A schematic overview of the IN1EGRAL modeling system and the relationship among its components is provided in Figure 2. Resident Models A 'resident model' is a model that is fully integrated into the DSS, is always loaded when the DSS is active, and is readily accessible by any DSS user. These models are geared toward supporting daily operational decision making. Two types of resident models are planned to be incorporated into the DSS: a Power and Reservoir System model and site-specific models. A generic Power and Reservoir System Model (PRSYM) that can integrate multipurpose reservoir operations with power system economics will serve as the primary resident model in the DSS. The development of this model is a major task of the INTEGRAL Project. Specifications for PRSYM are discussed in Section 3. In addition to PRSYM, the DSS will include site-specific models. These models will be used to address scheduling or operational issues at individual power plants or river reaches. For the TV A system, some examples include: diffuser mixing models at specific nuclear power plants, a hydro plant scheduling model used to ensure environmental by-pass flows at a downstream thermal power plant, and an economic model to evaluate the benefits of using cooling towers vs flow augmentation to meet environmental limits _ at a particular thermal plant. Other site-specific models could include water quality models at critical river reaches or detailed routing models at particular locations. The DSS will allow for the incorporation of site-specific models relevant to individual utilities or water resource agencies. Non-Resident Models Each utility has an existing suite of models that are currently used to support reservoir and power system operational and planning functions. Such models are often complex and require substantial expertise to utilize. Some examples include: . hydrology models, streamflow forecasting techniques, operational scheduling models, power and reservoir system planning models, and water quality models. In most cases, utilities have a substantial monetary and training investment in the use of these models. 2-4