Laserfiche WebLink
<br />The locations of the reaches determined for the flooding sources <br />of Montrose County are shown on the Flood profiles (Exhibit 1) and <br />summarized in Table 7. <br /> <br />5.2 Flood Hazard Factors <br /> <br />The Flood Hazard Factor (FHF) is used to establish relationships <br />between depth and frequency of flooding in any reach. This relation- <br />ship is then used with depth-damage relationships for various classes <br />of structures to establish actuarial insurance rate tables. <br /> <br />The FHF for a reach is the average weighted difference between the <br />10- and 100-year flood water-surface elevations rounded to the <br />nearest one-half foot, multiplied by 10, and shown as a three- <br />digit code. For example, if the difference between water-surface <br />elevations of the 10- and 100-year floods is 0.7 foot, the FHF is <br />005; if the difference is 1.4 feet, the FHF is 015; if the differ- <br />ence is 5.0 feet, the FHF is 050. When the difference between the <br />10- and 100-year flood water-surface elevations is greater than <br />10.0 feet, it is rounded to the nearest whole foot. <br /> <br />5.3 Flood Insurance Zones <br /> <br />Flood insurance zones and zone numbers are assigned based on the <br />type of flood hazard and the FHF, respectively. A unique zone <br />number is associated with each possible FHF, and varies from 1 for <br />an FHF of 005 to a maximum of 30 for an FHF of 200 or greater. <br /> <br />Zone A: <br /> <br />Special Flood Hazard Areas inundated by <br />the 100-year flood, determined by approxi- <br />mate methods; no base flood elevations <br />shown or FHFs determined. <br /> <br />Zones A1-A7, A9, A10, <br />A14, and A19: <br /> <br />Special Flood Hazard Areas inundated <br />by the 100-year flood; with base <br />flood elevations shown, and zones sub- <br />divided according to FHFS. <br /> <br />zone B: <br /> <br />Areas between the Special Flood Hazard <br />Areas and the limits of the SOO-year <br />flood, areas that are protected from <br />the 100- or SOO-year floods by dike, <br />levee, or other local water control <br />structure; areas subject to certain <br />types of 100-year shallow flooding where <br />depths are less than 1.0 foot; and areas <br />subject to 100-year flooding from sources <br />with drainage areas less than 1 square <br />mile. Zone B is not subdivided. <br /> <br />Zone C: <br /> <br />Areas of minimal flood hazard; not sub- <br />divided. <br /> <br />33 <br />