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CH2M HILL 2-1 CVO\042030003 SECTION 2 SYSTEM DESCRIPTION Eugene Water & Electric Board (EWEB) operates a public community water system serving Eugene, Oregon, and a small number of customers located outside the city limits. EWEB’s system has been assigned the state and federal Public Water System Identification No. 41000287. This section provides an overview of the system by describing the customer base, recent water use history, water rights, and the facilities that make up the system. Service Area and Population Exhibit 2-1 provides an overview map of the EWEB service area, including the EWEB-supplied water companies and districts. The service area is generally bounded by Interstate 5 on the east, the McKenzie and Willamette Rivers on the north, rural areas and farmland on the west, and forested hills on the south. EWEB’s estimated service population for year 2004 is 168,000. This estimate was based on census data and information supplied by the Lane Council of Governments (LCOG). The particular methodology for translating census data to a service population estimate for EWEB is described in the chapter on growth projections. Water Use EWEB’s average day demands for the past 20 years have ranged from 22.0 mgd in 1983 to 30.5 mgd in 1998 and again in 2000. The trend over this period for average day demands has been an increase of 0.28 mgd per year. As typical for Western Oregon utilities, EWEB’s demands show a marked increase during the summer months because of outdoor irrigation. During the past 20 years, the summer demands (June through September) averaged 1.8 times the winter demands. The summer to winter multiplier range was 1.4 to 2.1 times. For the period of 1998-2002, summer demands averaged 2.0 times the winter demands. The highest recorded maximum day demand for the system was 68.8 mgd in 1998. The second highest value of 65.3 mgd was recorded in 2003. The trend over the past 20 years has been an increase at the rate of 0.42 mgd per year. It is common for maximum day demands to fluctuate more than average day demands. The maximum day demand occurs in the summer because of outdoor irrigation. It is not uncommon for the maximum day demand to drop compared to previous years if the summer is relatively cool and wet. Conversely, it may increase sharply from one year to the next if the summer is relatively hot and dry. About 50 percent of water use in the EWEB system is by residential customers, with the remaining 50 percent used by commercial and industrial customers. 2020 Eugene Wastewater Master Plan Appendix B-6