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OOUi:CS-t , The Startup and Utilities module is targeted for I to 2 hours and is the primary prerequisite for most of the modules which follow. It would be helpful if the user has some familiarity with Unix, but this is not absolutely required. DBI. World-Wide Web Database Access The WWW (World-Wide Web) Database Access module of the CRDSS uses the Mosaic software as the user interface for data access, display and retrieval. With a web browser like Mosaic you can access the CRDSS "Home Page", and conduct data reviews in tabular and graphical formats, download data retrievals to your local system, and interact with the CRDSS developers and users using built-in messaging functions. Data available through the web browser interface include a spectrum ofCRDSS datasets for river flow, diversion, and climatic time series; and water rights. The WWW Database Access module is targeted for about 2 hours and would be of interest to anyone requiring the data provided. There are no prerequisites for this module. DB2. Visual Data Browser Utility The Visual Database Browser provides access to map-oriented data products. The VDB supports interactive access to the various spatial data products, color graphic display and browsing of these data, and tabulation of data characteristics. Interactive data review functions include menu selection of data sets, color display, overlay ~f vectors and sites onto images, zooming and panning across maps, multiple map management, variable resolution control, legend display, and map history review. Spatial data sets accessible for the entire Colorado River basin in Colorado by VDB include: elevation, irrigated lands, land use, soils, precipitation, evaporation, river network, basin boundaries, counties, divisions and districts, road network, public land survey, cities, river gage sites, climate gage sites, reservoirs, and headgates. The Visual Database Browser module is targeted for four hours and requires that the user have completed the Startup and Utilities training. MI. Consumptive Use Model The Consumptive Use (CU) Model computes evapotranspiration water losses from irrigated crops and other uses. It uses accepted procedures such as the Blaney- Criddle method and databases on irrigated lands, climate and historic water applications to estimate this important quantity for the various basins of the Colorado River basin in Colorado. The model is implemented with a user-friendly interface with which the user can select the area of interest, the method to be applied, and details of the area such as crop type and area.