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<br />100-year flood more than 1.0 foot at any point. Typical <br />relationships between the floodway and the floodway fringe and <br />their significance to floodplain development are shown in Figure 2. <br /> <br />I- <br /> <br />100-YEAR FLOODPLAIN <br /> <br />.1 <br /> <br />_ FLOODWAY <br />FRINGE <br /> <br />. <br /> <br />J::LOODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM _ <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />ENCROACHMENT <br /> <br />ENCROACHMENT <br /> <br />............. ................... <br />.................................. - <br /> <br /> <br />FLOOD ELEVATION BEFORE <br />ENCROACHMENT ON FLOODPLAIN <br /> <br />AREA OF FLOODPLAIN THAT COULD BE USED <br />FOR DEVELOPMENT BY RAISING GROUND <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER 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 <br />are assigned to a community based on the <br />analyses. These zones are as follows: <br /> <br />insurance zone designations <br />results of the engineering <br /> <br />Zone A <br /> <br />Zone A 15 the flood insurance rate zone that corresponds to the <br />IOO-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 or depths are shown wi thin <br />this zone. <br /> <br />Zone AE <br /> <br />Zone AE is the flood insurance rate zone that corresponds to the <br />100-year floodplains that are determined in the Flood Insurance <br />Study by detailed methods. In most instances, whole-foot base <br /> <br />16 <br />