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<br />I. <br /> <br />100-YEAR FLOODPLAIN <br /> <br />-I <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 /> <br /> <br />ENCROACH M E NT <br />o <br />. <br /> <br />SUR-CHARGE. <br /> <br />.................. ........... <br />................ .......... <br />........... ........... <br /> <br />AREA OF FLOODPLAIN THATCOULD BE USED FOR <br />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 NOTTO EXCEED 1.0 FOOT (FIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 4. Floodway Schematic <br /> <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 100-year flooding where the contributing <br />drainage area is less than 1 s~uare 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 />6.0 FLOOD INSURANCE RATE MAP <br /> <br />The Flood Insurance Rate Map is designed for flood insurance and <br />floodplain management applications. <br /> <br />'. <br /> <br />For flood insurance applications, the map designates flood insurance <br />rate zones as described in Section S.O and, in the 100-year floodplains <br />that were studied by detailed meth(>ds, shows selected whole-foot base <br />flood elevations or average depths. Insurance agents use the zones and <br />base flood elevations in conjunction with information on structures and <br />their contents to assign premium rates for flood insurance policies. <br /> <br />18 <br />