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<br />The locations of the reaches"determined for the flooding sources <br />of Jamestown are shown on the Flood Profiles (Exhibit 1) and <br />summariz~d in Table 3. <br /> <br />5.2 <br /> <br />Flood Hazard Factors <br /> <br />. <br /> <br />The FHF is the Federal Emergency Management Agency device used <br />to correlate flood information with insurance rate tables, Correla- <br />tions between property damage from floods and their FHF are used <br />to set actuarial insurance premium rate tables based on FHFs <br />from 005 to 200. <br /> <br />.' <br /> <br />The FHF for a reach is the average weighted difference between <br />the 10- and 100-year flood water-surface elevations expressed <br />to the nearest one-half foot, and shown as a three-digit code. <br />For example, if the difference between water-surface elevations <br />of the 10- and 100-year floods is 0.7 foot, the FHF is 005; if <br />the difference is 1.4 feet, the FHF is 015; if the difference <br />is 5.0 feet, the FHF is 050, When the difference between the <br />10- and 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 FHFs, <br />the entire incorporated area of the Town of Jamestown was divided <br />into zones, each having a specific flood potential or hazard, <br />Each zone was assigned one of the following flood insurance zone <br />designations: <br /> <br />Zones A4, AS, AG, A9, <br />AID, and A24: <br /> <br />Special Flood Hazard Areas inundated <br />by the 100-year flood, determined <br />by detailed methods; base flood eleva- <br />tions shown, and zones subdivided <br />according to FHFs. <br /> <br />Zone B: <br /> <br />Areas between the Special Flood Hazard <br />Areas and the limits of the SOD-year <br />flood, including areas of the SOD-year <br />flood plain that are protected from <br />the 100-year flood by dike, levee, <br />or other water control structure; <br />also areas subject to certain types <br />of 100-year shallow flooding where <br />depths are less than 1,0 foot; and <br />areas subject to 100-year flooding <br />from sources with drainage areas less <br />than 1 square mile. Zone B is not <br />subdivided. <br /> <br />~ <br /> <br />: <br /> <br />. <br /> <br />15 <br />