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Upper Colorado River Basin Study Scope of Work October 1, 1998 . . Existing conditions as defined by the Management Committee after meetings with Hydrosphere. . Year 2030 with Denver's demands at 371,000 AF and a total system yield of 401,000 AF (30,000 AF reserved supply safety factor) and West Slope demands reflecting full build out in the Upper Colorado basin study area This scenario captures the proposed general projects outlined in the Denver Water Board's recent policy statement (16K conservation, 15 KAF reuse, 10 KAF system refmements, 15 KAF new supplies). This modeled scenario would weight 15K AF of the new supply projects toward utilization of Denver's northern collection system. . Year 2030 as above, only weighted so that new projects would maximize use of Denver's southern collection system. . The Management Committee would outline two additional future scenarios to be defined mid-project. This may include evaluating a currently nonexistent project such as Jasper Reservoir. Each of these scenarios includes assumptions about East Slope and West Slope demand levels, major project components.and changes in water source "mix" for the Denver area. It is the intent of these scenarios to bracket the extremes of water use in order to identify potential problems. Native flows at up to five locations will be developed, based upon data available from P ACSM, to assist in understanding the relative cumulative impacts from existing and future scenarios. A memo documenting these scenarios will be provided to the Management Committee. The required model input data files representing transbasin diversions, major reservoir operations and in-Basin demands for each scenario would then be generated based upon P ACSM output data, adjusted as needed. 4.8 Analytical Tools and Map-Based Interface The issues to be addressed in this Study will require that changes in stream flows and reservoir levels resulting from various water development scenarios be estimated with reasonable accuracy at the specified locations in the study area. Specific effects on future water supplies for individual in-basin water users and general effects on ambient water quality at the specified locations under these scenarios will also be of particular interest. The results of these analyses must be easily viewable and comparable, and additional scenarios must be easily evaluated in support of discussions anticipated to occur in Phase III. The information "viewability" needs of the Study will require the simplicity and flexibility of an illustration tool or tools similar to those developed in the SB 96-74 Study and in support of Colorado's Platte River discussions. However, the level of detail and 7