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<br />30 years. At an effective rate of return (interest rate minus inflation rate) of 4%, this yields a <br />present worth of approximately $26,000 over a 100 year life of the structure. This value is <br />relatively small in comparison to the overall value of the tank. <br /> <br />The last point to be made about composite tanks is the status of any standards governing the <br />design of these styles of tanks. The A WW A (American WatelWorks Association) has been <br />the body that is primarily responsible for setting standards for the elevated tank industry. <br />The A WW A is currently generating a standard for this relatively new style of tank. A <br />Standard does not guarantee the success of an elevated tank; that responsibility rests on the <br />builder and the engineer. A Standard does set a minimum design criteria to be used and <br />ensures that all tank manufacturers are designing to these same minimum criteria The <br />A WW A standard tends to be conservative, but this is an area which conservatism is justified <br />due to the working difficulties involved with actually constructing these tanks and to the <br />catastrophic consequences of failure. Steel tanks constructed since, and in conformance to <br />the A WW A D-lOO Standard, have had an excellent success rate. For these reasons, it is <br />recommended that bids not be received on the composite style of water tank for this project. <br /> <br />Water Tower Feasibility Report <br /> <br />30 <br />