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<br />Flood Hazard Factors (FHFl, and flood insurance zone designations for <br />each flooding source studied in detail affecting the City of La Juntd. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as lengths of watercourses having relatively <br />the same flood hazard, ba sed on the average wei ghted 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 tdble for more than 20 percent of the 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 />One reach meeting the above criteria was required for the flooding <br />sources of the City of La Junta along the Arkansas River. Five <br />reaches were required along the Anderson Arroyo and two along the <br />King Arroyo. The locations of the reaches are shown on the Flood <br />Profiles, <br /> <br />5,2 Flood Hazard Factors <br /> <br />The Flood Hazard Factor is used to correlate flood information with <br />insurance rate tables. Correlations between property damage from <br />floods and their assigned FHFs are used to set actuarial insurance <br />premium rate tables based on FHFs from 005 to 200. <br /> <br />The FHF for a reach is the average wei ghted difference between the <br />10- and 100-year flood water-surface el evations expressed to the <br />nea rest one- ha 1 f foot, and shown as a three- di g it code. For <br />examp 1 e, if the difference between wa ter- surface el eva ti ons of the <br />10- and 100-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 />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 City of La <br />Junta was divided into zones, each having a speci fic fl ood <br />potential or hazard. Each zone was assigned one of the following <br />flood insurance zone designations: <br /> <br />Zone A6, A7, A8, A9, AlG, <br />All, A13 and A16: <br /> <br />Special Flood Hazard Areas inundated by <br />the 100-year fl ood, determined by <br />detailed methods; base flood elevations <br />shown, and zones subdivi ded accordi ng <br />to Flood Hazard Factors. <br /> <br />14 <br />