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<br />0" . <br />. U v '" !+&n.Resident Models <br /> <br />Once that data has been transferred to the DSS it is accessible to all DSS users, as well as to <br />the models and analysis tools in the DSS environment. This data transfer may occur for the <br />purpose of providing input for the resident (pRSYM) model or in order to use the DSS <br />analysis tools for multi-criteria evaluation or performance analysis. Similarly, through the <br />use of DMIs it will be possible to transfer real-time status information (such as current <br />reservoir elevations or'temperature profiles) from the DSS to non-resident models. <br /> <br />Although the DSS will support the transfer of data through DMIs, it is expected that each <br />utility will have to develop customized DMIs to support their specific models and non- <br />resident databases. The exception is the DMI to a generalized hydrologic modeling system. <br />As explained below, a modular hydrologic modeling system and its DMI will be generically <br />available with the DSS framework for use at specified workstations. <br /> <br />Generalized Non-Resident Hydrologic Modeling System <br /> <br />It is required that the Integrated Modeling System include a general methodology for <br />generating reservoir system inflows and for accounting for meteorologic and climatic <br />influences on basin runoff. The Modular (Hydrologic) Modeling System (MMS), jointly <br />developed by the U.S. Geologic Survey and CADSWES (Leavesley et al., 1992; <br />CADSWES, 1992), has been selected to provide this generic framework for hydrologic <br />modeling. Justification for the selection of MMS and more detailed information regarding <br />the modeling system is provided by Ewing and Klueh (1993). <br /> <br />MMS is a computer software library and framework that provides general facilities for <br />hydrologic modeling, including data handling, user interface, a variety of conceptual <br />hydrologic models, statistical and sensitivity analysis tools, and streamflow forecasting <br />capabilities. MMS consists of three components: a master library, a model builder, and a <br />module builder. The master library currently contains selected modules from the USGS <br />Precipitation Runoff Modeling System (PRMS), the National Weather Service River Forecast <br />System (NWSRFS), the Streamflow Synthesis and Reservoir Regulation (SSARR) model, and <br />TOPMODEL. The model builder allows the user to select and interconnect modules from <br />the library to form a customized hydrologic model. MMS also provides a graphically <br />oriented user-interface, as well as statistical analysis tools for analyzing model results and <br />choosing the most appropriate modules for a particular application. The Extended <br />Streamflow Prediction (ESP) methodology for generating streamflow forecasts is included in <br />MMS. The modeling system is adaptable to the introduction of new modules or the addition <br />of new system features. Several enhancements to the system that are currently being <br />developed include: a geographic information system (GIS) interface; a data-management <br />system; and interface to external data-management and analysis systems. <br /> <br />Due to the complexity of hydrologic modeling and the large databases that are often <br />associated with these models, MMS will be a non-resident model. It is required, however, <br />that MMS be accessible through a window from the DSS environment. A customized Data <br /> <br />4-2 <br />