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<br />without increasing the water-surface elevation of the 100-year <br />flood more than 1.0 foot at any point. Typical relatioo.hip. <br />between the floadway and tht.'" ft"th.iwdY fl'i.n~~ alh1 thC:ll- :HgU.1Ll....::UH...c <br />to floodplain development are shown in Figure 2. <br /> <br />1<< <br /> <br />100-YEAR FLOODPLAIN <br /> <br />~I <br /> <br /><< <br /> <br />FLOODWAY <br />FRINGE <br /> <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 />ENCROACHMENT <br /> <br />ENCROACHMENT <br /> <br />.................. ........... <br />................ .......... <br />.........,. ........... <br /> <br />AREA OF FLOODPLAIN THAT COULD BE USED <br />FOR DEVELOPMENT BY RAISING GROUND <br /> <br />FLOOD 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 EXCEED 1D FOOT (FIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. F100dway Schematic <br /> <br />S.O 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 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. Whole-foot base flood elevations <br />derived from the detailed hydraulic analyses are shown at selected <br />intervals within this zone. <br /> <br />Zone X <br /> <br />Zone X is the flood insurance rate zone that corresponds to areas <br />outside the SOD-year floodplain, areas within the SOD-year <br />floodplain, areas of 100-year flooding where average depths are <br />less than 1 fDOt, areas of 100-year flooding where the contributing <br />drainage area is less than 1 square mile, and areas protected from <br /> <br />11 <br />