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I I I I I I I I I I I I I I I I I I I ~)2S t SECTION IV - DETAILED OPERATIONAL STUDY A monthly operational study of diversions for Battlement Mesa municipal water supply was conducted to determine the quantity and timing of depletions to the Colorado River as a result of pumping water from the Colorado to meet the needs of the community. The operational study also shows the size and timing of releases from Ruedi Reservoir which will be required. Data from the operational study are summarized in Table 3. Water requirements were determined for Battlement Mesa, which included domestic use for a population of 20,000, residential irrigation and irrigation of the golf course and other green areas. These water requirements are combined and are presented as "Pipeline Diversions" (Column 2) in Table 3. Return flows were calculated separately for sewage and irrigation return flow, and the combined return flows are shown in Column 3 of Table 3. Irrigation return flows are lagged to represent actual timing of depletion. Depletions to the Colorado River as a result of pipeline diversions by Battlement Mesa are found by subtracting monthly return flows from monthly diversions (see Column 4, Table 3). Using Table E-l of the 1977 CORSIM simulation study for the years 1941-1970 ("Dow Pumping Plant and Pipeline Monthly Direct Diversion Yields"), periods were identified when the pipeline diversions would be called out and supplemental storage water required. The timing and amount at Battlement Mesa of those replacement requirements are shown in Column 5. As indicated above, the operational study assumes a river loss of 5 percent, and thus the replacement requirement at Battlement Mesa is 95 percent of Ruedi releases. The required releases and the timing of those releases are shown in Column 6 of Table 3. (12)