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<br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, the Federal Insurance <br />Administration has developed a process to transform the data from the <br />engineering study into flood insurance criteria. This process includes <br />the determination of reaches, Flood Hazard Factors, and flood insurance <br />zone designations for each flooding source studied in det<li1 affecting <br />the unincorporated areas of La Plata County, Colorado. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as lengths of watercourses having relatively the <br />same flood hazard, based on the average weighted difference in <br />water-surface elevations between the 10- and 100-year floods. This <br />difference does not have a variation greater than that indicated in <br />the following table for more than 20 percent of the reach: <br /> <br />Average Difference Between <br />10- and 100-year Floods <br /> <br />variation <br /> <br />Less than 2 feet <br />2 to 7 feet <br />7.1 to 12 feet <br />More than 12 feet <br /> <br />p.5 foot <br />1,0 foot <br />2.0 feet <br />3.0 feet <br /> <br />The locations of the reaches determined for the flooding sources of <br />the unincorporated areas of La Plata County are shown on the Flood <br />Profiles (Exhibit 1) and sununarized in Table 3. <br /> <br />5.~ Flood Hazard Factors <br /> <br />The Flood Hazard Factor (FHF) is the Federal Insurance Administration <br />device used to correlate flood information with insurance rate <br />tables. Correlations between pr~perty damage from floods and their <br />FHF are used to set actuarial in~urance premium rate tables based on <br />FHFs from 005 to 200. <br /> <br />The FHF for a reach is the average weighted difference between the <br />10- and 100-year flood water_surface elevations expressed to the <br />nearest one-half foot, and. shown as a three-digit code. For example, <br />if the difference between water-surface elevations of the 10- and <br />100-year floods is 0.7 foot, theFHF is 005; if the difference is <br />1.4 feet, the FHF is 015; if the ,difference is 5.0 feet, the FHF is <br />050. When the gifference between the 10- and 100-year water-surface <br />elevations is greater than 10.0 feet, accuracy for the FHF is to the <br />nearest foot. <br /> <br />28 <br />