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sectors are based upon demand area averages. The data provided in the 1983 Regional Water Study indicated that most of the water suppliers could not separate two or more of these sectors. Although it was possible and justifiable to derive "systemwide" averages for these customer classes, further adjustment is not supported by the data. While the use factor model might underpredict or overpredict demand by these sectors for individual districts, the use factors correctly represent SFF. MF, E, and P sector demand for the EIS demand area. Sufficient data were available to allow consideration of single- family metered water use (SFM) on an individual district basis. The average water usage of 478 gallons per household per day for the EIS demand area is a weighted composite of the individual water districts which responded to DRCOG' s 1983 Regional Water Study Questionnaire. The use factor model modifies the SFM use factor for each district by adjusting for lot size, income, household size, and marginal price of water. When a supplier did not provide information on water use, the use factors were applied as if they had. Population, housing, and SFM sector socioeconomic characteristics were projected for the service area involved and the use factors were applied to the projections. The COE has developed separate use factors for the SFM and P sectors for the city and county of Denver and the suburbs. In deriving the separate use factors, OWD data were used to calculate demand in gallons per unit per day for the city and county of Denver. The suburban use factor was computed to be the number which when combined in a weighted average with the Denver use factor would yield the previously used combined use factor. Future demand projections will be calculated using the new use factors which are presented in table 2. 19