Colorado's Plan for Future Depletions

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Colorado's Plan For Future Depletions January 12, 1998 Documentation as Required by Cooperative Agreement, Page 4 Milestones W6-1, W7-1, W8-1, and Tab 3B(I)E By virtue of their proximity to these irrigated lands, municipal providers within the North Region can utilize agricultural water relatively easily. / The Central Region includes those portions of Denver, Adams, Arapahoe (90%), Jefferson, Park, Clear Creek and Gilpin Counties that are located within the South Platte River basin. Ninety percent of Arapahoe County's population is assumed to be in the Central region to reflect that portion of Arapahoe County's population that is served by the City of Aurora. The water supply options available to the Central Region are characterized by ready access to the South Platte River, Clear Creek and transbasin diversion projects owned by Denver and Aurora. This region also produces the bulk of reusable return flows within the basin and has considerable opportunities for water reuse via exchanges and direct reuse. Virtually all water supplies within this region are surface supplies. Most of the extsting and future municipal water demands within this Region will be served by the water supply systems of Denver and Aurora which include significant transba??,imports. The South Region includes those portians of the following counties that are located within the South Platte River basin: Arapahoe County (10°10), Douglas County and Elbert County. Ten percent of Arapahoe County's population is assumed to be in the South region to reflect that portion of Arapahoe County's population served by East Cherry Creek Valley. Water & Sanitation District and the Arapahoe County Water Authority. While small portions of Teller and El Paso Counties lie within the extreme southern part of the basin, they were ignored for the purposes of this tool and Colorado's Future Depletions plan because virtually all municipal water use within these two counties occurs within the Arkansas River basin. The water supply options available to the South Region are characterized by a primary dependerice on Denver Basi _n groundwater, a general absence of irrigated agricultural land and a scaxcity of native surface water supplies. The control buttons on the regional map allow the user to easily move around in the spreadsheet to eriter input and view results. 3 Input Sheet The input sheet includes background information on basin population and existing water supply sources. It also allows the user to select a Proposed Scenario or a Custom Scenario. Historical and projected populations within the South Platte River basin of the State of Golorado are shown in a graph and three tables. Population data for 1900 through 1990 are from U.S. Bureau of Census records. Population data for 1995-2020 are from a memo entitled "Colorado Preliminary Population Projections, Colorado Division of Local Government, September 1997". That memo is attached. Regional mixes of existing water supply sources are shown in the Existing Situation (1997) table and in the following table. These data are based on an inventory of existing water uses and water supply sources for South Platte basiri water providers. That inventory relied upon a