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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 detail affecting <br />the Town of Lyons. <br /> <br />, <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 p~dent of the reach: t <br /> <br />Average Difference Between <br />10- and 100-year Floods <br /> <br />Variation- <br /> <br />2 to 7 feet <br /> <br />LO foot <br /> <br />Three reaches meeting the above criterion were required for the <br />flooding sources of Lyons. These included_one reach each on St. <br />Vrain Creek, North St. Vrain Creek, and South St. Vrain Creek. The <br />locations of the reaches are shown on the Flood Profiles (Exhibit 1). <br /> <br />5.2 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 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 />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, the FHF 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 difference between the 10- and lOO-year water-surface <br />elevations is greater than 10:.0 feet, accuracy for the FHF is to the <br />nearest foot. <br /> <br />5.3 Flood Insurance Zones <br /> <br />After the determination of reaches and their respective Flood <br />Hazard Factors, the entire incorporated area of the Town of Lyons <br />was divided into zones, each having a specific flood potential or <br />hazard. <br /> <br />14 <br />