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DSS Component Assessment <br />maintained in INFORMIX, however database development activities and advanced data <br />communication products are allowing users to either run a local version of CRDSS on their computers <br />or to access data and perform analysis across computer networks, including the Internet. <br />The DSS Integration component is the glue that holds the system together; it helps users perform <br />complex modeling or analysis, handle large quantities of data efficiently, and visualize results. Also, <br />this component contains the documentation subsystem so that users can get information about using <br />the system, about the data contained in the database, and about the models. For the purpose of this <br />discussion, the DSS Integration component consists of the following items: <br />• Relational Database Management System <br />• Geographic Information System (GIS) <br />• System Integration Tools <br />• Documentation <br />All of these pieces are contained in the present CRDSS and are described further in Section 4.1.6 <br />4.1.2 Water Resources Planning <br />RGDSS can and should use the State of Colorado's Stream Simulation Model (StateMod), the same <br />model used in the CRDSS. StateMod is the water resources planning model used to assess past, <br />present, and future water management policies in Colorado basins and the same type of capability is <br />desired by water users in the Rio Grande basin. StateMod is a water allocation and accounting model <br />that computes natural streamflow (streamflow absent of any impact of man) and then allocates flow to <br />water rights (via diversions, storage, and instream flow requirements) in strict conformance with the <br />prior appropriation doctrine. The model currently operates on a monthly time step. A daily time step <br />version is currently under development and is expected to be available to the RGDSS. <br />StateMod represents river basins with a network of nodes that represent physical and legal operational <br />parameters. Reservoir operations and multiple storage accounting are addressed as are transfers and <br />other institutional policies. <br />4.1.2.1 Implementation <br />StateMod is a generic water rights planning model that can be configured for the Rio Grande and <br />implemented in the RGDSS with minor modification (Section 4.1.2.5). <br />4.1.2.2 Temporal/Spatial Scope <br />StateMod currently runs on a monthly time step. River networks typically include all stream gages, <br />key diversions, reservoirs, and instream flows. Small diversions can be modeled the same as key <br />diversions or accumulated into aggregate nodes so that 100 percent of the basin's consumptive use is <br />reflected in the model without significantly increasing the model's size. <br />4.1.2.3 System Requirements <br />StateMod runs as a stand-alone program or with a graphical user interface (GUI). When CRDSS is <br />complete, both the stand-alone version and the GUI will run on a PC platform. <br />4.1.2.4 Data Requirements <br />StateMod requires the following information: <br />• Water rights expressed as priorities and locations <br />a454/report/final/comp. doc 07/2&~OS Y-2 <br />