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<br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, the Federal Emergency <br />Management Agency 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 detail affecting <br />the City of Fort Collins. <br /> <br />5.1 Reach Determination <br /> <br />Reaches are defined as lengths of watercourses having relatively <br />the same flood hazard, based on the average weighted difference in <br />water-surface elevations between the 10- and 100-year floods. <br />This difference does not have a variation greater than that <br />indicated in the following table for more than 20 percent of the <br />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 />Ten reaches meeting the above criteria were required for the <br />flooding sources of Fort Collins. These included six on Spring <br />Creek, two on Spring Creek Overflow, and one each ~n Dry Creek and <br />the Cache La poudre River. The locations of the reaches are shown <br />on the Flood Profiles (Exhibit 1). <br /> <br />5.2 Flood Hazard Factors <br /> <br />The Flood Hazard Factor (FHF) is the Federal Emergency Management <br />Agency device used to correlate flood information with insurance <br />rate tables. Correlations between property damage from floods and <br />their FHF are used to set actuarial insurance premium rate tables <br />based on FHFs from 005 to 200. <br /> <br />The FHF for a reach is the average weighted difference between the <br />10- and laO-year flood water-surface elevations expressed to the <br />nearest one-half foot, and shown as a three-digit code. For <br />example, if the difference b~tween water-surface elevations of the <br />10- and lOO-year floods is 0.7 foot, the FHF is 005; if the <br />difference is 1.4 feet, the FHF is 015; if the difference is 5.0 <br />feet, the FHF is 050. When the difference between the 10- and <br />100-year water-surface elevations is greater than 10.0 feet, <br />accuracy for the FHF is to the nearest foot. <br /> <br />17 <br />