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Department of the Interior Geological Survey (USGS) Digital Line Graphs (DLG) from the State Engineers? Office <br />(SEO) and the source of 500k data is Colorado State Department of Local Affairs (DOLA). <br />Hydrologic Units <br />The CRDSS Spatial Database has two raster and two vector maps for the entire Western Slope showing hydrologic <br />units that describe boundaries and drainage areas. These data are used to determine drainage areas for the water <br />rights and consumptive use models and are also used for data analysis. This coverage was generated using 250k <br />resolution data obtained over the Internet from the United States Geological Survey. This coverage was then <br />resampled by the IDS Group (CSU) using the Hydrology at 100k resolution (/crdss/arc/crdss_arc/hydro/hydro100) <br />and Elevation Contours at 100k resolution (/crdss/arc/crdss_arc/topography/cont100m). New points were selected <br />based on elevation and river features in Arc/Info. One raster and one vector map were produced by combining the <br />HUC and County boundaries and are also included with the GRASS coverages. <br />River Reach Data <br />This information was retrieved and evaluated, but the consultant was not required of complete this task since the data <br />contained in the Hydrography coverages from the USGS fulfill this category of data. <br />State Water Division and Water District Boundaries <br />The CRDSS Spatial Database has two raster and two vector maps that spatially indicate State Engineer?s water <br />divisions and district boundaries and two label maps with the district and division labels. These data have been <br />obtained from the State?s inventory in Arc/Info format at a resolution of 1000k. RTi improved its resolution to 100k <br />based on the 100k Hydrologic Units and the 100k hydrology coverages (crdss/arc/crdss_arc/huc/huc100k) developed <br />by the IDS Group (CSU). <br />Municipal Locations and Populations <br />The CRDSS Spatial Database has a site map for the locations and labels of municipalities with the name and <br />populations from 1990 census data obtained from the United States Department of Commerce, Bureau of the Census. <br />County Boundaries <br />The CRDSS Spatial Database has one raster and one vector map that spatially indicate County boundaries. This <br />coverage was obtained from the Colorado State Department of Local Affairs (DOLA). <br />Highways and Roads <br />The CRDSS Spatial Database has a vector map showing the major road and highways. Coverages are from the 1990 <br />census data obtained from the United States Department of Commerce, Bureau of the Census. <br />Irrigated Parcels of Land (Crop Type and Locations) <br />The CRDSS Spatial Database has separate raster and vector maps for each division and one raster map for the entire <br />Western Slope. Data were obtained from the Colorado Department of Natural Resources, Division of Water <br />Resources. Type of crops implemented in these coverages include: alfalfa, beans, corn, grass, orchards, small grain, <br />tree farms, vegetables, undetermined crops, and open water features. The Arc/Info coverage was developed from <br />remote sensed Landsat TM imagery. Boundaries were further enhanced by digitizing on-screen using SPOT <br />panchromatic imagery base. The coverage was then transferred to mylar overlay and State Engineering Office (SEO) <br />Page 2 <br />01/03/97 2.03- <br />01- Lange <br />