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<br />1< <br /> <br />lOO-YEAR FLOODPLAIN <br /> <br />.\ <br /> <br />_ FLOODWAY __ < <br />FRINGE <br /> <br />FLOO'DWAY <br /> <br />.. <br /> <br />LOODWAY <br />FRINGE <br /> <br />STREAM _ <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />C <br />.. .................................... <br /> <br /> <br />ENCROACHMENT <br />D <br />. <br /> <br />ENCROACHMENT <br /> <br />SURCHARGE * <br /> <br />AREA OF FLOODPLAIN THAT COULD BE USED <br />FOR DEVELOPMENT BY RAISING GROUND <br /> <br />FLOOO ELEVATION BEFORE <br />ENCROACHMENT ON FLOODPLAIN <br /> <br />LINE AB IS THE FLOOD ELEVATION BEFORE ENCROACHMENT, <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT, <br />'SURCHARGE IS NOT TO EXCEEO 1.0 FOOT (FIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE, <br /> <br />Figure 8. FloodwaySchematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />For flood insurance rating purposes, ,flood insurance zone designations <br />are assigned to a community based on the results of the engineering <br />analyses. These zones are as follows: <br /> <br />Zone A <br /> <br />Zone A is the flood insurance <br />lOa-year floodplains that are <br />Study by approximate methods. <br />are not performed for such <br />depths are shown this zone. <br /> <br />r:ate zone that corresponds to the <br />determined in the Flood Insurance <br />B~cause detailed hydraulic analyses <br />areas, no base flood elevations or <br /> <br />Zone AE <br /> <br />Zone AE is the flood insurance rate zone that corresponds to the <br />lOa-year floodplains that are ~etermined in the Flood Insurance <br />Study by detailed methods. Whole-foot base flood elevations <br />derived from the detailed hydrautic analyses are shown at selected <br />intervals within this zone. <br /> <br />66 <br />