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<br />floods and their FHF are used to set actuarial insurance premium <br />rate tables based on FHFs from 005 to 200. <br /> <br />The FHF for a reach is the average weighted difference between the <br />10- and lOa-year flood water-surface elevations expressed to the <br />nearest 1/2 foot, and shown as a three-digit code. For example, if <br />the difference between water-surface elevations of the 10- and 100- <br />year floods in 0.1 foot, the FHF is 005; if the difference is 1.4 <br />feet, the FHF is 015; if the difference is 5.0 feet, the FHF is <br />050. When the difference between the 10- and lOa-year water- <br />surface elevations is greater than 10.0 feet, accuracy for the FHF <br />is rounded to the nearest foot. <br /> <br />5.3 Flood Insurance Zones <br /> <br />After the determination of reaches and their respective FHFs, the <br />entire unincorporated area of Weld County was divided into zones, <br />each having a specific flood potential or hazard. Each zone was <br />assigned one of the following flood insurance zone designations: <br /> <br />Zone A: <br /> <br />Special Flood Hazard Areas inundated by <br />the lOa-year flood, determined by <br />approximate methods; no base flood <br />elevations shown or FHFs determined. <br /> <br />Zone AO: <br /> <br />Special Flood Hazard Areas inundated by <br />types of lOa-year shallow flooding where <br />depths are between 1.0 and 3.0 feet; <br />depths are shown, but no FHFs are <br />determined. <br /> <br />Zones Al through A9: <br /> <br />Special Flood Hazard Areas inundated by <br />the lOa-year ,flood, determined by detailed <br />methods; base flood elevations shown, and <br />zones subdivided according to FHFs, <br /> <br />Zone B: <br /> <br />Areas between the Special Flood Hazard <br />Areas and the limits of the 500-year <br />flood, including areas of the 500-year <br />floodplain that are protected from the <br />lOa-year flood by dike, levee, or other <br />water control structure; also areas <br />subject to certain types of lOa-year <br />shallow flooding where depths are less <br />than 1.0 foot; and areas subject to 100- <br />year flooding from sources with drainage <br />areas less than 1 square mile. Zone B is <br />not subdivided. <br /> <br />Zone C: <br /> <br />Areas of minimal flooding. <br /> <br />Zone D: <br /> <br />Areas of undetermined, but possible flood <br />hazard. <br />