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<br />The area between the floodway and 100-year flood plain boundaries <br />is termed the floodway fringe. The floodway fringe encompasses <br />the portion of the flood plain that could be completely obstructed <br />without increasing the water-surface elevation of the 100-year <br />flood by more than 1.0 foot at any point. Typical relationships <br />between the floodway and the floodway fringe and their significance <br />to flood plain development are shown in Figure B. <br /> <br />I- <br /> <br />1 OO.YEAR FLOOD PLAIN <br /> <br />-, <br /> <br />F LOODWA Y <br />FRINGE <br /> <br /> <br />FLOODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br /> <br />D <br /> <br />... <br />FLOOD ELEVATION <br />BEFOREENCRQACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />.SURCHARGE ISNQTTOEXCEED 1.0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure B. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />To establish actuarial insurance rates, data from the engineering study <br />must be transformed into flood insurance criteria. This process includes <br />the determination of reaches, Flood Hazard Factors, and flood insurance <br />zone designations for each flooding source studied in detail affecting <br />Glenwood Springs. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as sections of flood plain that have relatively <br />the same flood hazard. based on the average weighted difference in <br />water-surface elevations between the 10- and 100-year floods. This <br />difference may not have a variation greater than that indicated in <br />the following table for more than 20 percent of the reach: <br /> <br />22 <br />