Colorado's Plan for Future Depletions

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. . Colorado's Plan For Futuie Depletions Documentation as Required by Cooperative Agreement, Milestones W6-1, W7-1, W8-1, and Tab 3B(I)E 4.5 Monthly Municipal RF and CU Factors January 12, 1998 Page 7 The monthly municipal return flow and consumptive use factors included in the Calculations sheet were derived using the same methodology and data as described in Section 4.2 above. In this case, each month's consumptive use was subtracted from each month's treated water delivery to obtain the monthly return flow factor. Consumptive use factors are simply 1 minus the return flow factor. 4.6 Supply-Specific Use Patterns The assumed supply-specific use patterns are presented in the table below and are discussed in the following sections. Supply-Specific Use Patterns Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec New Transbasin Imports - Use 6% 6% * 5% 6% 8% 11% 13% 15% 12% 8% 6% 5% Pattern Nontributary GW - Use Pattern 3% 3°l0 4% 7% 12% 13% 16°l0 15% 11% 8% 5% 4% In-basin Agricultural Conversion - Use Pattern Conservation - Use Pattern Water Reuse - Use Pattern Native South Platte Storage - Diversion Pattern Native South Platte Storage - Use Pattern 2% 2% 2% 5% 16% 16°l0 16% 16% 16°l0 5% 2% 2% 5% 4% 5% 7% 10% 13% 15% 13% 1.1% 7% 5% 5% 2% 2% 2% 5% 15% 10% 23% 22% 10% 5% 2% 2% 0% 0% 0% 5% 40%-50% 50/o 0% 0% 0% 0% .0% 9% 8% 8% 6% 4% 0% 4% 15% 17% 11% 9% 9% 4.6.1 Transbasin Imports - Use Pattern The use pattern for transbasin imports is based on a compilation of transbasin use patterns for Denver Water, Aurora, and municipal users of the Colorado-Big Thompson and Windy Gap projects. These users represent the vast majority of municipal transbasin water use in the South Platte basin. Estimates of Denver Water's average transbasin use pattern were obtained from Denver's most recent modeling studies, done as part of its Integrated Resource Plan, depicting the operation of its water supply system at a future demand level of 390,000 AF/year. Specifically, average