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I i I I !~_~.Q.~~.C;:J~~_APP~l.fA TION 5.0 ~ In order to establish actuarial insurance rates, the Federal Insurance Administratio~ has developed a process to transform the data from the engineering study into flood insurance criteria. This process includes the determination of reaches, Flood Hazard Factors, and flood insurance zone designations for each flooding source studied in detail affecting the Town of Frisco. ... 5.1 Reach Determinations Reaches are defined as lengths of watercourses having relatively the same I flood hazard, based on the average weighted difference in water-sutface elevations between the 10- and lOO-year floods. I This difference does not have a variation greater than that indicated in the following table for more than 20 percent of the reach: Average Difference Between 10- and 100-year Floods _ ~ . ,- '~_..... ~~ . "'._"_'~''''''U.. '.~.."'''''''__~__ Variation Less than 2 feet 2 to 7 feet 7.1 to 12 feet More than 12 feet 0.5 foot 1. 0 foot 2.0 feet 3.0 feet "J The locations of reaches determined for the flooding sources of the Townlof Frisco are shown on the Flood Profiles (Exhibit 1) and sununarized in Table 3. 5.2 Flood Ha~ard Factors , The Flood Hazard Factor (FHF) is the Federal Insurance Administration device u~ed to correlate flood information with insurance rate tables. !Correlations between property damage from floods and their FH~ are used to set actuarial insurance premium rate tables based onlFHFs from 005 to 200. i The FHF for a reach is the average weighted difference between the 10- and lOO-year flood water-surface elevations expressed to the nearest 6ne-half foot, and shown as a three-digit code. For example, !if the difference between water-surface elevations of the 10- and 100-year floods is 0.7 foot, the FHF is 005; if the difference is 1.4 f~et, the FHF is 015; if the difference is 5.0 feet, the FHF is O~O. When the difference between the 10- and 100-year water-su~face elevations is greater than 10.0 feet, accuracy for the FHF is to the nearest foot. ~ 11 ~.