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<br />5.3 flood Insurance Zones <br /> <br />After the determination of reaches and their respective Flood <br />Hazard Factors, the entire unincorporated area of La Plata County <br />was divided into zones, each having a specific flood potential <br />or hazard. Each zone was assigned one of the following flood <br />insurance zone designations: <br /> <br />~one 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 Flood Hazard Factors <br />determined. <br /> <br />~ones A2-A8 and All: <br /> <br />Special Flood Hazard Areas inundated by <br />the lOa-year flood, determined by <br />detailed methods; base flood elevations <br />shown, and zones subdivided according <br />to Flood Hazard Factors. <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 />flood plain that are protected from the <br />lOO-year flood by dike, levee, or other <br />water control structure; also areas <br />subject to certain types of lOO-year <br />shallow flooding where depths are less <br />than 1.0 foot; and areas subject to <br />IOO-year flooding from sources with <br />drainage areas less than 1 square mile. <br />Zone B is not su~diviaed. <br /> <br />Zone c: <br /> <br />Areas of minimal flooding. <br /> <br />Zone D: <br /> <br />Areas of undetermined, but~ possible <br />flood hazard. <br /> <br />The flood elevation diffe~ences, Flood Hazard Factorsr flood insur- <br />ance zones, and base flood elevations for each flooding source <br />studied in detail in the county are summarized in ~able 3. <br /> <br />33 <br />