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NHD-based network analysis with. other data layers, such as land use, soils, geology, topography, <br />and vegetation, to help understand and display their respective effects. on one another. . <br />Arc hydro <br />Arc I-Iydro is a data model built using ArcGIS, specifically for water resource applications. It <br />combines geospatial and temporal water resource data to support hydrologic analysis and <br />modeling. For the Roaring Fork Stream Flow Survey Project, it provides the linkage between <br />point features such as stream gages and water diversions, linear features such as the stream <br />network and any associated information on riparian and aquatic habitat and fish distribution, and <br />polygon features such as land use, geology, topography, precipitation, etc. These linkages among <br />geographic features in different layers can be used to trace water movement from feature to <br />feature through the landscape. Additionally time series information about water measurements <br />can be linked with all the other geospatial data. <br />Comfnunityl~iz (h~tt ://www.com:rr~uni 'z.org~ <br />CommunityViz develops GIS-based decisfon support tools that may allow us to envision <br />alternatives and understand their potential impacts, explore options and share possibilities with <br />stakeholders, and examine scenarios. CommunityViz has been developed as an extension to <br />ArcGIS. Identifying critical stream reaches and providing output about specific watersheds that <br />contribute to critical flow conditions and hydrologic alteration appears to be a useable input to <br />Community-Viz modeling. <br />CDSS <br />The CDSS's State of Colorado's Stream Simulation Model (StateMod) hydrologic model <br />developed by the Colorado Water Conservation Board (CWCB) and the Colorado Division of <br />Water Resources (DWR) is built with data developed for this project (e.g. streams, gauging <br />stations, diversions, water rights). The advantage of using this system is that the relationships <br />and model already have been built (a considerable investment). Stream gage and water diversion <br />data are tied together (but with unique ID information, thus not linked to NHD). CDSS and <br />StateMod are used mainly for consumptive use modeling. StateMod consists of four (4) major <br />components: the Base Flow module, the Simulation module, the Report module, and the Data <br />Check module. The Base Flow module produces a set of streamflows which would have <br />occurred in the basin without a user specified level of man's development. If all of man's <br />influence is removed, the base flow developed would represent natural stream flows. The <br />Simulation module operates the river system and accounts for inflows, river gains, diversions, <br />instream flows, well pumping, and reservoir operations. The Report module processes the results <br />of the Simulation module into user specified reports and graphs data sets. The Data Check <br />module reads the input files and performs various data checks. <br />Following is a general sequence for operating StateMod: <br />1. Develop a stream node network based on the location of key gages, river confluences, <br />reservoirs, diversions, welts, and instream flows (see map Figure 2 for location of nodes <br />in Roaring Fork Basin). <br />2. Construct the necessary monthly input files using the formats described in Section 4.0. <br />3. Check the input files by executing StateMod's Data Check Module. <br />4 <br />