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I I I I I I I I I I I I I I I I, I I I ,...~ ~.olI ,., ":' 1') I. .~ .._ -' .. .. 1988, an increase of almost 60,000 ac-ft since 1980. Within the NCWCD boundaries (Study Area 1), H&1 water demands increased by more than 20,000 ac-ft, or about 20 percent, between 1980 and 1988. Within Study Areas 2 and 3, M&1 water demands respectively grew by 8,000 ac-ft (a 140 percent increase) and 27,000 ac-ft (a 40 percent increase). To develop water demands for the future, the study team performed four basic steps: interviews and data collection; selection of the water demand fore- casting technique; demographic projections; and application of demographic projections to provide forecasts of water demands. Data Col1ection An extensive primary data collection effort was undertaken involving each individual water supply entity in the study area. Following the initial demographic and water demand projections, review and refinement of those projections with the respective entities was accomplished. An advisory committee composed of representatives from the entities in Study Areas 1 and 2 was also established to provide coordinated review. Water Deland Forecasting Technique Examination of alternative demand forecasts presently utilized by water providers within the study area indicated that an approach involving water use factors (e.g., gallons per capita per day, gallons per water tap per day, gallons per acre per day, etc.) was most common. A limited number of water suppliers utilized a sectoral approach, which is more complex but can be more accurate. The selection of a demand forecasting approach for the Regional Water Supply Study considered the prevalence of existing forecasting approaches and the need for consistency and understanding among the 59 water supply entities included in the study area. -7-