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<br />The area between the floodway and 100-year floodplain boundaries is <br />termed the floodway fringe. The floodway fringe encompasses the <br />portion of the floodplain that could be completely obstructed <br />without increasing the WSEL of the 100-year flood by more than <br />1.0 foot at any point. Typical relationships between the floodway <br />and the floodway fringe and their significance to floodplain <br />development are shown in Figure 2. <br /> <br />Ie <br /> <br />100-YEAR FLOODPLAIN <br /> <br />-I <br /> <br />FlOODWAY <br />FRINGE <br /> <br />III <br /> <br />FlOODWAY <br /> <br />LOOOWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FlOODWA Y <br /> <br /> <br />ENCROACHMENT <br /> <br />AREA OF FLOODPlAIN THAT COULD BE USED FOR <br />DEVELOPMENT BY RAISING GROUND <br /> <br />UNE AIlS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD 1$ THE FLOOD ELEVATION AFnR ENCROACHMENT. <br />.SURCHARGE IS NOT TO EXCEED 1.0 FOOT (FIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />For flood insurance rating purposes, flood insurance zone designations are <br />assigned to a community based on the results of the engineering analyses. <br />These zones are as follows: <br /> <br />Zone A <br /> <br />Zone A is the flood insurance rate zone that corresponds to the <br />lOO-year floodplains that are determined in the FIS by approximate <br />methods. Because detailed hydraulic analyses are not performed for <br />such areas, no Base Flood Elevations (BFEs) or depths are shown in <br />this zone. <br /> <br />Zone AE <br /> <br />Zone AE is the flood insurance rate zone that corresponds to the <br />lOO-year floodplains that are determined in the Frs by detailed <br />methods. Whole-foot BFEs derived from the detailed hydraulic <br />analyses are shown at selected intervals within this zone. <br /> <br />45 <br />