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~~~ identify the location(s) where ground water return flows accrue to the river for use in StateMod applications based on ground water model results compute canal length for key and aggregated structures Note that the new GIS-based data management capabilities may be merged with the existing StateDGI or StateDGI maybe revised to operate as a custom tool for the ArcGIS software. Document enhancements made to StateDGI and custom tool capabilities and use. Provide 1/a day training session at the State Engineers Office to update State users on revisions. Approach: 18.1 Develop a set of scripts in the ArcGIS software package to compute a list of aggregate surface water structures and ground water only parcels given: a tabular list of key structures, a shape file of irrigated lands with associated surface water structure water district identifiers, and a polygon coverage of aggregate areas. This script will produce a list of non-key structure IDs in each aggregate area and a list of parcel IDs for ground water only parcels. A summary file that is compatible with other CDSS data management interfaces (e.g. TSTooI, StateDMI, etc.) will be created that lists number of structures in each aggregate, and the total acreage for each aggregate. Develop a custom tool for the ArcGIS software package that calls a simplified user interface that enables the user to save and recreate the analysis either from a menu system or apre-defined command file. Test and confirm the applications functionality by applying it to the South Platte basin. 18.2 Develop a set of scripts in the ArcGIS software package to compute the upstream drainage basin boundary given a point shapefile of gage locations and a digital elevation model (DEM) of the study area. Calculate the drainage areas based on the computed drainage basin boundary or a polygon shapefile of drainage area boundaries. For the DEM approach, data will be in Arclnfo grid format and the analysis will require the Spatial Analyst extension to ArcGIS. Regardless of the approach used to define drainage area, the results of the analysis will produce a list of gage ID numbers from the original shapefile and the associated drainage areas tributary to each point that is compatible with other CDSS data management interfaces (e.g. TSTooI, StateDMI, etc.). In addition, for the DEM approach a polygon coverage will be created for each point delineating the drainage area. These polygons can then be used to analyze any parameter for each basin from grid data such as average precipitation, climate station weighting, or average elevation. Existing functionality and interfaces within the ArcGIS software package will be utilized where possible. Develop a custom tool for the ArcGIS .software package that calls a simplified user interface that enables the user to save and recreate the analysis either from a menu system or apse-defined command file.. Test and confirm the applications functionality by applying it to the South Platte basin and comparing results to the drainage area estimates published in a current USGS water supply paper. 18.3 Develop a set of scripts in the ArcGIS software package to compute the downstream point(s) of surface return flow from irrigation structures given a polygon shapefile of irrigated lands, a polyline shapefile representing the stream network as modeled in StateMod, and a (DEM) of the study area. This application will be used to determine surface returns only, or to estimate locations of total return flows when there. is not a ground water model of the area of interest, such as CRDSS applications or SPDSS applications outside of the ground water model study area. Note that when determining the location of total return flows in the absence of gradient information; this approach assumes Exhibit A-1Page 9