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<br />The floodways presented ln this table were computed for <br />certain stream segments on the basis of equal conveyance <br />reduction from each side of tp,e floodplain. Floodway widths <br />were computed at cross sectiolis. Between cross sections, the <br />floodway boundaries were interpolated. The results of the <br />floodway computations are tabulated at selected cross sections <br />(Table 2). In cases where the floodway and lOa-year <br />floodplain boundaries are either close together or collinear, <br />only the floodway boundary has been shown. <br /> <br />The area between the floodway and lOa-year floodplain <br />boundaries is termed the floodway fringe. The floodway fringe <br />encompasses the portion of the floodplain that could be <br />completely obstructed without increasing the water-surface <br />elevation of the 100-year flood more than 1.0 foot at any <br />point. Typical relationships between the flod'dway and the <br />floodway fringe and their significance to floodplain <br />development are shown in Figure 13. <br /> <br />I' <br /> <br />l00.YEAR FLOODPlAIN <br /> <br />.1 <br /> <br />- <br /> <br />FLOOOWAY <br />FRINGE <br /> <br />l' <br /> <br />FLOODWAY <br /> <br />LOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOOOWA Y <br /> <br /> <br />ENCROACHMENT <br /> <br />AREA OF FLOODPLAIN THAT COULD BE USED <br />FOR DEVELOPMENT BY RAISING GROUND <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 13. Floodway Schematic <br /> <br />23 <br />