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<br />comparing the benefits (reduction of damages and loss of life) to the costs <br /> <br />associated with purchasing and maintaining a system. Such analysis is also <br /> <br />helpful in selecting the type of local flood warning system appropriate for a <br /> <br />given community. Appendix A contains a detailed description of the benefit- <br /> <br />to-cost analysis that can be conducted by a community. It is important for <br /> <br />community officials to review all possible sources of funding before making <br /> <br />decisions on a local system. <br /> <br />B.4. Warning Time as Related to Benefits <br /> <br />Warning time is a critical factor in mitigating flood losses. The more lead <br /> <br />time available for appropriate action, the greater the reduction in flood <br /> <br />damages that can be achieved. Figure 6 depicts the relationship between <br /> <br />warning time and the percent reduction of damages, often expressed as warning <br /> <br />time vs. benefits. <br /> <br />40 <br /> <br />MAXIMUM PRACTICAL EVACUATION (MPEl <br /> <br />'" <br />... <br />co <br />.. <br />~ 30 <br />.. <br />! <br />~ 23 ....................,................ <br />i: <br />u 20 <br />:0 <br />.. <br />... <br />.. <br />... <br />z <br />... <br />u <br />.. <br />... <br />... <br /> <br />---------- <br /> <br /> <br />. <br /> <br />o ~ 2 4 I <br /> <br />12 14 <br /> <br />18 <br /> <br />Z4 <br /> <br />30 <br /> <br />36 <br /> <br />42 <br /> <br />48 <br /> <br />FORECAST WARNING TIME(ERROR FREEl HOURS <br /> <br />DAMAGE REDUCTION VS WARNING TIME <br /> <br />FIGURE 6 <br /> <br />18 <br />