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<br />Computer Model <br /> <br />The computer model of Centerville's water system was obtained from the City and prepared by <br />MSA Engineers. The model as received, depicted Centerville's existing water system including one <br />tank and two wells. The tank was labeled Tl and it consisted of a 1 OO,OOO-gallon reservoir located <br />at the intersection of Shad Avenue and Fox Run with a high water level of 1048 and a low level of <br />1029.1. The model also contained the two wells which were designated as Constant Power 50 hp <br />pumps drawing from a surface reservoir which we believe was meant to model the aquifer <br />elevation. However, there must have been an error in the surface reservoir configuration as the <br /> <br />pumps were not able to supply any flow with the 50-hp motors and consequently water ran <br />backwards through the pumps into the surface reservoir (aquifer). Therefore, we eliminated the <br />pump / surface reservoir combination and input a flow of 625 gallons per minute at the Well No.1 <br />location to represent firm capacity. The water use demands in the model were labeled maximum <br />day and accounted for a total demand of 393 gallons per minute. This would appear to be a <br />r~SQnable approximation of maximum day demand. The model was run with the modification <br />described above and the fire flow results matched reasonably well with the data shown on Exhibit <br />6-2 of the 1997 Comprehensive Water Plan. <br /> <br />Tank Location <br /> <br />This memo reviews the proposed elevated tank for the City of Centerville. Three tower sites were <br />evaluated for their ability to provide fire flow to the City. These results were then compared to the <br />Exhibit 6-3 results shown in MSA's Comprehensive Plan Eat!~ February 1997. <br /> <br />The first site evaluated for the proposed water tower is referred to as the Industrial Park Tower Site <br />and is located on Outlot A on the ~est side of 20th Ave North, due east of the extension ofE~gle <br />Trail. This tower site has a number of advantages from a distribution standpoint in that it puts the <br />maximum available fire flow near a proposed industrial park area where the highest fire flows are <br />generally required. If the tower were constructed today with no main improvements other than <br />those that are in place, the tank would provide excellent fire flow protection to the industrial park <br />but would be isolated on a lengthy section of dead-end line. This would be a problem both from a <br />~ --- <br /> <br />reliability standpoint and from a re-fill standpoint. After a heavy use (such as a fire flow), it would <br />