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Average Difference Between 10- and lOa-Year Floods 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 5.2 Flood Hazard Factors The Flood Hazard Factor (FHF) is the Federal Insurance Administra- tion device used to correlate flood information with insurance rate tables. Correlations between property damage from floods and their FHF are used to set actuarial insurance premium rate tables based on FHFs from 005 to 200. The FHF for a reach is the average weighted difference between the 10- and IOO-year flood water-surface elevations expressed to the nearest one-half foot, and shown as a three-digit code. For example, if the difference between water-surface elevations of the 10- and lOa-year floods is 0.7 foot, the FHF is 005; if the difference is 1.4 feet, the FHF is 015, if the difference is 5.0 feet, the FHF is 050. When the difference between the 10- and lOO-year water-surface elevations is greater than 10.0 feet, accuracy for the FHF is to the nearest foot. 5.3 Flood Insurance Zones After the determination of reaches and their respective Flood Hazard Factors, the unincorporated areas of summit County were divided into zones, each having a specific flood potential or hazard. Each zone was assigned one of the following flood insurance zone designations: zone A: Special Flood Hazard Areas inundated by the lOa-year flood, determined by approximate methods; no base flood elevations shown or Flood Hazard Fac- tors determined. Zone AO: Special Flood Hazard Areas inundated by types of lOa-year shallow flooding where depths are between 1.0 and 3.0 feet, depths are shown, but no Flood Hazard Factors are determined. 25