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<br />Other Engineering Considerations <br /> <br />Altitude Valves <br /> <br />Altitude control valves are essential features of any water system that contains multiple <br />water storage reservoirs. Altitude control valves sense the pressure at the valve, which <br />directly corresponds to the level of the water in the tower. Since hydraulic grade lines <br />between supply and storage facilities are never exactly the same, there needs to be some <br />method of allowing for these differences without overflowing either of the towers on the <br />system. By properly setting the altitude control valves, the furthest towers from the supply <br />points can be filled without overflowing the closer towers. <br /> <br />For this reason, we propose to install an altitude valve system at the existing elevated water <br />tower if Centerville decides not to remove the tower from the system. This assures that the <br />new tower can be filled without overflowing the lower existing tower. Considerations for <br />the configuration of the altitude valves will be required due to available space and the actual <br />configuration of influent and effluent water mains from the existing elevated tank. <br /> <br />Altitude valves are a significant source of water system maintenance and operator time. The <br />ability to avoid the addition of an altitude valve by removing the existing 100,000 gallon <br />tank from service is another reason that this was recommended. <br /> <br />Hydraulic Performance <br /> <br />A hydraulic analysis was performed to make sure that the results of the 1997 Comprehensive <br />Water Plan were still valid-with respect to this elevated tower and to check interim <br />performance conditions. Concerns over the availability of flows for fire for the City were <br />analyzed. An analysis from the old system was updated and compared with field <br />measurements as shown earlier in this report. Fire flow analysis of the existing system does <br />currently meet most requirements, but the addition of this tank and the looping of dead end <br />water mains will improve the reliability of water for fighting fires in the City. <br /> <br />Water Tower Feasibility Report <br /> <br />18 <br />