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<br />Six reaches meeting this criterion were required for the flood- <br />ing sources of Greenwood Village. These included one on each stream <br />studied in detail. The locations of the reaches are shown on the <br />Flood Profiles (Exhibit 1), <br /> <br />5.2 Flood Hazard Factors <br /> <br />The Flood Hazard Factor (FHF) is the Federal Insurance Administra- <br />tion device used to correlate flood information with insurance rate <br />tables. Correlations between property damage from floods and their <br />FHF are used to set actuarial insurance premium rate tables based on <br />FHFs from 005 to 200. <br /> <br />The FHF for a reach is the average weighted difference between the <br />10- and 100-year flood water-surface elevations expressed to the <br />nearest one-half foot, and shown as a three-digit code. For example, <br />if the difference between water-surface elevations of the 10- and <br />100-year floods is 0,7 foot, the FHF is 005; if the difference is <br />1.4 feet, the FHF is 015; if the difference is 5,0 feet, the FHF is <br />050. When the difference between the 10- and 100-year water-surface <br />elevations is greater than 10.0 feet, accuracy for the FHF is to the <br />nearest foot. <br /> <br />5.3 Flood Insurance Zones <br /> <br />After the determination of reaches and their respective Flood Hazard <br />Factors, the entire incorporated area of Greenwood Village was <br />divided 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 AI, A2, A3: <br /> <br />Special Flood Hazard Areas inundated <br />by the 100-year flood determined by <br />detailed methods; base flood elevations <br />shown, and zones subdivided according to <br />Flood Hazard Factors. <br /> <br />Zone B: <br /> <br />Areas between the Special Flood Hazard <br />Area and the limits of the 500-year <br />flood, including areas of the 500-year <br />flood plain that are protected from the <br />100-year flood by a dike, levee, or <br />other water control structure; or, <br />areas subject to certain types of 100- <br />year shallow flooding where depths are <br />less than 1.0 foot. Zone B is not sub- <br />divided, <br /> <br />Zone c: <br /> <br />Areas of minimal flooding. <br /> <br />13 <br />