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lOO-year floods is 0.7 foot, the FHF is 005; if the difference is 1.4 feet, the FHF is Ol5; if the difference is 5.0 feet, the FHF is 050. When the difference between the lO- and 100-year water- surface elevations is greater than 10.0 feet, accuracy for the FHF is to the nearest fooL 5.3 Flood Insurance Zones {:" After the determination of reaches and their respective Flood Hazard Factors, the entire unincorporated area of Mesa County was divided into zones, each having a specific flood potential or hazard. Each zone was assigned one of the following flood insur- ance zone designations: ~. .' Zone A: Special Flood Hazard Areas inundated by the 100-year flood, determined by approximate methods; no base flood elevations shown or Flood Hazard Factors determined. Zone AO: Special Flood Hazard Areas inundated by types of 100-year shallow flooding where depths are between 1.0 and 3.0 feet; depths are shown, but no Flood Hazard Factors are determined. i< Zones AI, A2, A4-A7, A9, and A14: Special Flood Hazard Areas inundated by the 100-year flood, determined by detailed methods; base flood elevations shown, and zones subdivided according to Flood Hazard Factors. Zone B Areas between the Special Flood Hazard Areas and the limits of the 500-year flood, including areas of the 500-year flood plain that are protected from the 100-year flood by dike, levee, or other water control structure; also areas subject to certain types of 100-year shallow flooding where depths are less than 1.0 foot; and areas subject to lOO-year flooding from sources with drainage areas less than 1 square mile. Zone B is not subdivided. " Zone c: Areas of minimal flooding. Table 5, "Flood Insurance Zone Data," summarizes the flood elevation differences, Flood Ha~:ard Factors, flood insurance zones, and base flood elevations for E!ach flooding source studied in detail in the county. -;,. 25 f""->aa.,,--,-