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population rate increase over the study period, with the 2000 population more than fifty times the <br />population of 1950. In contrast, Washington County and Jackson County have experienced <br />negative population rates over the study period. <br />2. Historical Municipal and Industrial Water Demands <br />Municipal and industrial water demands in the basin include both municipal water users and self- <br />supplied industrial (SSI) water users. Demands represent the amount of diversion necessary to <br />satisfy municipal and/or industrial uses. <br />Municipal Water users Demand <br />The SWSI unit demand rates, based on year 2000 demands, includes average demand rates in <br />gallons per capita per day (gpcd) for municipalities and unincorporated populations in Colorado <br />counties. User information from 17 municipalities, USGS data, and information and data from <br />various studies, including the following, were used in the SWSI analysis: <br />• CWCB Drought Study Report <br />• Colorado Water Development Study <br />• South Platte Water Conservation Project <br />• South Metro Water Supply Study <br />• Metropolitan Water Supply Investigation <br />• Interstate 70 Corridor Preliminary Environmental Impact Statement <br />The results provided by Camp, Dresser, and McKee, Inc. (CDM) in the SWSI Report closely <br />match the municipal water demands and consumptive use information provided by <br />municipalities for the SPDSS Task 5 effort. The information used in the SWSI Report showed <br />that the per capita demand for municipalities that rely on ground water supplies are similar to <br />municipalities that rely on surface water. Based on a review of the data and discussions with <br />CWCB and CDM, the decision was made to use the well-researched SWSI county water demand <br />rates along with user-supplied data provided by municipalities for Task 5. These demand rates <br />can be viewed as average-year demands and may not explicitly represent variable municipal <br />water uses that may occur in wet and dry years. Use of average-year values is appropriate for <br />planning purposes. <br />County unit demand rates (2000) in the SPDSS study area from the SWSI Report are <br />summarized in the County portion of Table 1 (see the previous section) and Figure 2, and range <br />from 113.2 gallons per capita per day (gpcd) in Elbert County to 340.7 gpcd in Morgan County. <br />These demand rates include industrial and commercial water uses served by municipal water <br />systems but do not include SSI water uses, which are addressed further below. User-supplied <br />demand rates for the Key Municipalities interviewed in Task 5 are included in the Key <br />Municipality portion of Table 1 (see previous section). <br />Task 66.2 Memorandum.doc Page 6 of 26 <br />