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the past eight years, average winter and summer daily demands are approximately 36,500 gallop <br /> and 71,900 gallons, respectively! The unusually low July -to- January ratio of 0.52 in 1989 <br /> warrants an explanation. For the months of January through March of that year, City staff opened <br /> several hydrants in an attempt to maintain circulation throughout the system and avoid freezing <br /> the water tower. <br /> TABLE 3-4. JANUARY AND JULY WATER DEMANDS <br /> CITY OF CENTERVILLE <br /> Average Day Pumpage (Gallons) July to January <br /> Year January July Ratio <br /> 1989 75,561 39,555 0.52 <br /> 1990 15,750 55,484 3.52 <br /> 1991 23,613 52,645 2.23 <br /> 1992 33,742 59,806 1.77 <br /> 1993 36,710 52,839 1.44 <br /> 1994 43,919 84,642 1.93 <br /> 1995 50,387 59,387 1.18 <br /> 1996 51,613 138,194 2.68 <br /> Average° 36,533 71,857 2.11 <br /> t ' 3 1989 was not included in the above average calculations. <br /> The demand imposed on a water system can be defined as the total water consumed by users of <br /> the system in a specified period of time. Typically, daily and hourly time periods are evaluated. <br /> Daily demands are usually evaluated on the basis of average day and peak day requirements. <br /> Table 3 -5 presents historic annual data for average day and peak day pumpage in Centerville. The <br /> data was obtained from City water pumpage records for the past seven years (1989 to 1996). The <br /> ratio of peak day to average day (peaking factor) varied from a Iow of 2.38 to a high of 6.74, and <br /> averaged 4.0 for the years 1989 to 1996. Excluding the unusually high years of 1989 and 1994 <br /> gives an average ratio of 3.37. <br /> Maximum day ratios greater than 3.00 are generally considered very high —ratios in the range of <br /> 2.50 to 3.00 are more typical. However, water use in small communities can be very erratic and <br /> it is not uncommon to find maximum day ratios over 3.00. Although all of the factors that <br /> contribute to such high consumption cannot be identified with absolute certainty, it is reasonable <br /> to expect that lawn sprinkling, watering of plantings and gardens, and car washing are the primary <br /> factors. On June 30, 1994, such factors were compounded by the draining of the water tower, <br /> which froze the previous winter, and resulted in the peak day pumpage of 428,000 gallons. In <br /> 1994, the next highest pumpage of 226,300 gallons occurred on June 27. <br /> Cwe- 260A.080 3-4 260-080-25 <br />