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<br />VERSION 1.0 1/12/95 <br /> <br />B-C PROGRAM: Flood Hazard Risk <br /> <br />CHAPTER 7 <br />BENEFIT-COST PROGRAM: FLOOD HAZARD RISK <br /> <br />Introduction <br /> <br />This section contains data entries for flood frequencies, discharges and <br />elevations which are necessary to specify quantitatively the extent of <br />flood hazard at the site under evaluation. From the entered flood data, <br />the program calculates the expected annual number of floods in one- <br />foot elevation increments. "Expected" annual number means the long <br />term statistical average number per year, not that this number of floods <br />occurs every year. <br /> <br />The degree of flood risk at a particular site profoundly affects the <br />expected flood damages at a site and thus profoundly affects the <br />benefits of avoiding flood damages at the site. Therefore, the flood <br />hazard data entered in this section are among the most critical data <br />inputs for benefit-cost analysis of flood hazard mitigation projects. <br /> <br /> <br />LEVEL ONE <br />Analysis <br /> <br />A LEVEL ONE Flood Hazard Risk Analysis is performed using <br />information from a FIS and a FIRM, or equivalent information, for the <br />location under evaluation. Data on flood frequencies, discharges, and <br />elevations are entered into the Flood Data table shown on page 7-2. <br /> <br /> <br />LEVEL TWO <br />Analysis <br /> <br />If a FIS and a FIRM are not available, or if the user desires to use other <br />estimates of flood hazard risk, then a LEVEL TWO Analysis must be <br />performed. <br /> <br />7-1 <br /> <br />" <br />