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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 0ptermination of reaches, Flood Hazard Factors, and flood insurance <br />zone designations for each flooding source studied in detail affecting <br />the City of Lafayette. <br /> <br />. <br /> <br />5.1 Reach Determinations <br /> <br />. <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 IOO-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 /> <br />0.5 foot <br />1.0 foot <br /> <br />Three reaches meeting the above criteria were required for the <br />flooding sources of Lafayette. These included one reach on Coal <br />Creek and two reaches on Rock Creek. The locations of the reaches <br />are shown on the Flood Profiles (Exhibit 1) and summarized in Table 3. <br /> <br />5.2 Flood Hazard Factors <br /> <br />The Flood Hazard Factor (FHF) is the Federal Insurance Administra- <br />tion device used to correlate flood information with insurance rate <br />tables. Correlations between property damage from floods and their <br />FHF are used to set actuarial insurance premium rate tables based on <br />FHFs from 005 to 200. <br /> <br />. <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 the water-surface elevations of the 10- <br />and 100-year floods is 0.7 foot, the FHF is 005; if the difference <br />is 1.4 feet, the FHF is 015; if the difference is 5.0 feet, the FHF <br />is 050. When the difference between the 10- and 100-year flood <br />water-surface elevations is greater than 10.0 feet, accuracy for the <br />FHr is to the nearest foot. <br /> <br />5.3 <br /> <br />Flood Insurance Zones <br /> <br />. <br /> <br />After the determination of reaches and their respective Flood Hazard <br />Factors, the entire incorporated area of the City of Lafayette was <br />divided into zones, each having a specific flood potential or hazard. <br /> <br />11 <br />