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II I I I I I I I I I I I I I I I I I I desi gned based on thei r capacity to del i ver treated water to meet these demands. Future projections of system improvements are based on the anticipated maximum daily use rate and the population estimates. The maximum daily demand estimated for the year 2028 is 12.6 million gallons. The present City pumping system has the capacity to deliver this daily demand. The peak hourly rates are important as the basis for sizing distrib'.Jtion works. While the objective of this study is not concerned with the distribution system design, these elements were examined to check the overall consistency of the system. To serve 35,000 people, the peak hourly rate is estimated as 21.4 million gallons per day. The actual annual water use was 356 million gallons for 1986, a low water use year. Average conditions would have resulted in an annual water demand of about 475 mi 11 i on gallons, based on the average per capi ta use rate of 130 gallons per day for the estimated population of 10,000 people. For the projected population of 35,000 people, annual consumption is expected to increase 350 percent to 1,661 million gallons. This means average daily water use will increase from 1.3 million gallons to 4.6 million gallons. Figure IV.2 graphically displays the projected annual water usage over the period between 1985 and 2030. 1.3 Historical Use Pattern Based on the most recent five-year period, 1982 through 1986, Table IV.l presents the average monthly demand pattern for the City. The maximum monthly needs for treated water usually occur in June, July, and August. These are the hottest months and correspond wi th the peri od of hi ghest evapotranspi r- ation potential for lawn grasses. The colder months, October through April, have the lowest demands because lawns are dormant and no longer irrigated. - 18 -