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<br />I- <br /> <br />100-YEAR FLOODPLAIN <br /> <br />-I <br /> <br />.. <br /> <br />HOODWAY --.- ..c. <br />FRINGE <br /> <br />FLOODWAY <br /> <br />. <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 />AREA OF FLOODPLAIN THAT COULD BE USED FOR <br />DEVELOPMENT BY RAISING GROUND <br /> <br /> <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 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 <br />are assigned to a cOllllllunity 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 />lOO-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 SOO-year floodplain, areas within the SOO-year <br />floodplain, areas of lOO-year flooding where average depths are <br />less than 1 foot, areas of lOO-year flooding where the contributing <br />drainage area is less than 1 square mile, and areas protected from <br />the 100-year flood by levees. No base flood elevations or depths <br />are shown within this zone. <br /> <br />11 <br />