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CHAPTER 3 WATER USE 3.1 HISTORIC WATER USE. One of the most important aspects of any comprehensive water study is having a clear understanding of how a City's consumers use water. With this information and accurate records of past usage, projections can be made of future water demand. A course of action can then be developed to meet this demand. The City of Centerville maintains records of the annual volume of raw water pumped from its wells, as well as the volume of water sold to its customers. These records permit evaluation of all the components of water demand —the water used by residential, commercial, industrial, and institutional users. Table 3 -1 presents historic service area population and water use data for the past eight years. The service area population for 1996 includes the Centerville Elementary School population Of 900 students in addition to the City's residential and commercial water customer population. The inclusion of this population dramatically increases the average service area population for the last seven years. For the period from 1990 to 1996, the total water pumped on an annual basis has increased 289%. During the same time, the service population has also increased. Including the school population the service area population has increased 459% since 1990. Excluding the school population, the increase was 257%. It appears that the entire increase in water use is likely due to the increase in population. TABLE 3 HISTORIC POPULATION AND WATER SgRVICE INFORMATION at CITY OF CENTERVILLE Total Water Total Water Pumped Service Area Service Sold a) from Wells Year Population Connections (1,000 gal) (1,000 gal) 1989 N/A N/A N/A 11,005 1990 447 142 8,650 11,108 1991 567 181 10,115 13,560 1992 750 239 14,257 19,870 1993 788 252 16,358 17,130 1994 852 279 22,378 23,191 1995 932 301 21,852 22,150 CWP- 260A.080 3 -1 260-080-25