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The occurrence of the peak day date in the winter months of 1989 can be explained by the <br /> hydrants being opened to prevent the tower from freezing, as explained in Section 3.5. In fact, <br /> the second highest pumpage of 108,480 gallons also occurred that winter on February 11. The <br /> third highest pumpage was 97,000 gallons and occurred on August 9. <br /> TABLE 3 -5. PEAK WATER CONSUMPTION <br /> CITY OF CENTERVILLE/ <br /> Peak Day 1 Gallons Peak Day to <br /> Year Date Peak Day Use Average Day Use Average Day Ratio <br /> 1989 Jan 6 151.5 30.2 5.03 <br /> 1990 Aug 15 124.0 30.4 4.07 <br /> 1991 Aug 16 106.5 37.2 2.87 <br /> 1992 Jun 12 211.0 54.2 3.89 <br /> 1993 May 21 111.5 46.9 2.38 <br /> 1994 Jun 30 428.0 63.5 6.74 <br /> 1995 Jun 21 240.0 60.7 3.95 <br /> r <br /> 1996 Jul 17 270.0 87.8 3 1 <br /> Average 1989 to 1996 205.3 51.4 4.00 <br /> Average without 1989 & 1994 177.2 52.9 3.37 <br /> 3.6 UNACCOUNTED -FOR WATER USE <br /> As in all water systems, some of the water produced is never purchased by its customers. The <br /> unaccounted -for water use is estimated by comparing the average annual water production with <br /> the average annual metered consumption of a system. The difference between the two values is <br /> the unaccounted -for water use. <br /> Unaccounted -for water use can result from many factors. Some of the most prevalent factors <br /> include unidentified leaks in a pipe network, watermain breaks, periodic fire hydrant flushing, <br /> tank drainage for maintenance purposes, unauthorized use, unmetered services, and inaccurate <br /> meters. Unaccounted -for water use below 10% can be explained by normal system leakage and <br /> meter inaccuracies. Even the best of today's systems have these problems, and it is simply not <br /> cost - effective to try to eliminate all leakage. Meters that are 100% accurate do not exist. <br /> Table 3-6 gives a history of unaccounted -for water use in the City of Centerville between 490 <br /> and 1996. Over the past seven years, unaccounted -for water averaged approximately 12.2% of <br /> the total water pumpage. At this point, it is important to note that, in 1993, the City began to <br /> monitor the water it produced and sold to customers by computer. Prior to that time, such <br /> information was recorded by hand and in a much less accurate and efficient manner. It is felt that <br /> this change in process produced the dramatic reduction in unaccounted -for use between 1992 and <br /> CWP- 260A.080 3 -5 260 - 080 -25 <br />