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<br />As shown on the Flood Boundary and Floodway Map (Exhibit 2), the <br />floodway boundaries were determined at cross sections; between <br />cross sections, the boundaries were interpolated. In cases where <br />the floodway and IOO-year flood boundaries are close toqether, only <br />the floodway boundary has been shown. <br /> <br />The area between the floodway and the boundary of the IOO-year <br />flood is termed the floodway fringe. The floodway fringe thus <br />encompasses the portion of the flood plain that could be completely <br />obstructed without increasing the water-surface elevation of the <br />IOO-year flood more than 1.0 foot at any point. Typical relation- <br />ships between the floodway and the floodway fringe and their signifi- <br />cance to flood plain development are shown in Figure 2. <br /> <br />I- <br /> <br />100-YEAR FLOOD PLAIN <br /> <br />'I <br /> <br />FLOODWAY <br />FRINGE <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 />SURCHARGE. <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br /> <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <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. <br /> <br />Floodway Schematic <br /> <br />14 <br />