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A floodway is not presented in thi s report because the City is on the outer edge of the floodway fringe and the fl oodway for the Rio Grande does not enter the corporate limits of Monte Vista. 5.0 INSURANCE APPLICATION In order to establish actuarial insurance rates, Federal Emergency Management Agency has developed a process to transfon11 the data from the engineering study into flood insurance criteria. This process incl udes the deten11ination of reaches, Flood Hazard Factors (FHF), and flood insurance zone designations for each flooding source studied in detail affecting the City of Monte Vista. 5.1 Reach Determinations Reaches are defined as lengths of watercourses having relatively the same flood hazard, based on the average weighted difference in water- surface elevations between the 10- and 100-year floods. This differ- ence 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 Less than 2 feet 2 to 7 feet Va ri a ti on 0.5 foot 1.0 foot One reach meeting the above criteria was required for the flooding source of the City of Monte Vista. The location of the reach is shown on the Flood Profile. 5.2 Flood Hazard Factors The Flood Hazard Factor (FHF) is used to correlate flood information with insurance rate tables. Correlations between property damage from floods and their assigned FHF' s are used to set actuarial insurance premium rate tables based on FHF's from 005 to 200. The FHF for a reach is the average weighted difference between the 10- and 100-year flood water-surface el evations expressed to the nearest one- ha 1 f foot, and shown as a three- di git code. For exampl e, if the di fference between water- surface el eva ti ons of the 10- and 100-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 100-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 entire incorporated area of the City of Monte Vista was divided into zones, each having a specific flood potential or hazard. Each zone was assigned one of the following flood insurance zone designations: 9