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Metropolitan Water Supply Investigation MWSI Results I I I I I I I I I I I I I I I I I I I Practices' approach has been taken to water conservation. Under this approach, individual providers have agreed to implement an agreed-upon package of water conservation practices. 3.1.5. Existing Conditions During the course of the MWSI and the Denver Basin and South Platte Basin Technical Study (SB74 Study), water use inventory information was collected for all major water providers in the South Platte Basin. This information included service area populations, raw water uses, and general mix of water supply sources used by each provider or provider group. Based on the inventory information collected during various phases ofthe MWSI, the 1996 service area population, water use, and average existing mix of water supply sources for South Platte Basin municipal providers are shown in Table 2. The existing water supplies of metro Denver area providers are briefly summarized by sub-region in the following sections. This information is provided as a general reference point for average conditions. The relative roles of individual water sources change considerably from year to year, primarily in response to variations in native South Platte River flows. During dry years, providers rely more heavily on transbasin imports, Denver Basin groundwater and releases from storage. In wet years, native South Platte supplies playa more prominent role. 3.1.5.1. Denver Central Sub-Region The Denver Central sub-region is comprised of the Denver Water Combined Service Area, including the City and County of Denver, 75 fully dependent and over 20 partial supply contract providers; the City of Englewood and other small providers in the Bear Creek basin. The main sources of supply available to the this sub-region consist of South Platte municipal water rights and changed irrigation rights, transmountain diversions from the Blue, Fraser and Williams Fork Basins and water reuse. Denver Water obtains its native South Platte supplies from numerous municipal direct flow rights and from storage rights associated with its South Platte Reservoirs, principally Cheesman Reservoir, Eleven-Mile Reservoir, Marston Reservoir, Gross Reservoir, and its storage account in Chatfield Reservoir. Denver also diverts under changed irrigation rights that were previously used to irrigate lands in the vicinity of Chatfield Reservoir. Denver's transbasin supplies include its diversions from its Moffat Tunnel and Roberts 28 Prepared for the Colorado Water Conservation Board, Colorado Department of Natural Resources by Hvdrosnhere Resource Consultants. 1002 Walnut Street. Suite 200. Boulder. CO 80302