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DSS Component Assessment <br />4.2.1.2 Temporal/Spatial Scope <br />As designed, the URGWOM implementation of RiverWare will have several hundred nodes <br />corresponding to gages, reservoirs, and diversions for the entire Rio Grande basin. Within Colorado, <br />approximately 25 nodes have been proposed. These 25 nodes are intended to provide an aggregate <br />accounting of reservoir operations, supply, and diversions. <br />4.2.1.3 System Requirements <br />RiverWare currently runs on a SUN workstation in the UNIX environment with no plans to migrate <br />the system to a PC. Software licensing is required from the University of Colorado to use RiverWare. <br />4.2.1.4 Data Requirements <br />RiverWare is a data-driven simulation tool. Data are required to develop rule-based simulations, to <br />calibrate, and to perform run-time simulations. Types of data required include: <br />• Gage Streamflow <br />• Storage/Discharge Relationships <br />• Diversions <br />• Demands <br />• Detailed Reservoir Descriptions/Operations <br />• System Priorities for Operations (Including Flood Control) <br />• Inflows (Forecast) <br />• Precipitation <br />• Evaporation <br />• Physical Reach Descriptions <br />4.2.1.5 Specific RGDSS Issues <br />The CRDSS project has plans to purchase RiverWare and the associated hardware required to use it <br />as a stand-alone product. This same approach is recommended for the RGDSS. This approach would <br />eliminate porting costs, yet provide simulation capability for technical review for the State. <br />4.2.2 Ground Water Simulation <br />4.2.2.1 Implementation <br />Various numerical models of the aquifers of the valley exist. At least two were developed in past <br />years by different researchers at USGS, for different purposes and different parts of the valley. <br />Several numerical models exist that were developed by private entities in preparation for litigation. In <br />addition, the State Engineer's Office developed its own numerical model in the late 1980s and early <br />1990s in conjunction with the AWDI litigation. The State Engineer's Office model has not been <br />updated since late 1991. <br />The State Engineer's Office model provides the most comprehensive coverage of the valley. It is <br />available in the public domain and documentation is available. As a result, discussion will focus on <br />the State Engineer's Office model and the technical enhancements required for use in the RGDSS. <br />4.2.2.2 Temporal/Spatial Scope <br />The State Engineer's Office model represents the entire San Luis Valley, approximately bounded by <br />Poncha Pass on the north, the Colorado -New Mexico state line on the south, and the San Juan and <br />Sangre de Cristo mountain fronts on the west and east, respectively. The valley is broken into grid <br />a454/report/final/comp. doc 07/2&~OS Y-10 <br />