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<br />I ( <br /> <br />1 aO.YEAR FLOOD PLAIN <br /> <br />) I <br /> <br />FLOOOWAV <br />FRINGE <br /> <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN .FLOODWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMEN! BY <br />RAISING GROUND <br /> <br />FLOOQWA Y <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br /> <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCAOACHMENT. <br />.SURCHARGE ISNOTTO EXCEED 1.0 FboT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 10. Floodway Schematic <br /> <br />Average Difference Between <br />10- and 100-Year Floods <br /> <br />2 to 7 feet <br /> <br />Variation <br /> <br />1.0 foot <br /> <br />Nine reaches meeting the above criterion were required for the <br />flooding sources of Commerce City. These included four on the <br />South Platte and five on Sand Creek. The locations of the <br />reaches are shown on the Flood Profiles. <br /> <br />5.2 Flood Hazard Factors <br /> <br />The Flood Hazard Factor (FHF) is the Federal Insurance <br />Administration device used to correlate flood information with <br />insurance rate tables. Correlations between property damage from <br />floods and their FHF are used to set actuarial insurance premium <br />rate tables based on FHFs from 005 to 200. <br /> <br />The FHF for a reach is the average weighted difference between <br />the 10- and 100-year flood water-surface elevations expressed to <br />the nearest 0.5 foot, and shown as a three-digit code. For <br />example, if the difference between water-surface elevations of <br />the 10- and 100-year floods is 0.7 foot, the FHF is 005; if the <br />difference is 1.4 feet, the FHF is 015; if the difference is 5.0 <br /> <br />17 <br />