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<br />portion of the floodplain that could be completely ()bstrllctpd <br />without increasing the water-surface elevation of the IOO-year <br />flood more than 1.0 foot at any point. Typical relationships <br />between the floodway and the floodway fringe and their significance <br />to floodplain development are shown in Figure 2. <br /> <br />I" <br /> <br />100,YEAR FLOODPLAIN <br /> <br />.1 <br /> <br />. <br /> <br />FLOODWAY <br />FRINGE <br /> <br />. <br /> <br />FlOODWAY <br /> <br />LOODWAY <br />FRINGE <br /> <br />STREAM ........ <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />ENCROACHMENT <br /> <br /> <br />ENCROACHMENT <br /> <br />C <br /> <br /> <br />FLOOD ELEVATION BEFORE <br />ENCROACHMENT ON FLOODPLAIN <br /> <br />.. ............... .................., <br />.............. .................. <br />............. .................. <br /> <br />SURCHARGE .. <br /> <br />AREA OF FLOODPLAIN THAT COULD BE USED FOR <br />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 />S.O 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 />resul t s of the engineering <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 SOO-year <br />floodplain, areas of lOO-year flooding where average depths are <br /> <br />9 <br />