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<br />standards that can be adopted directly or that can be used as a <br />basis for additional floodway studies. <br /> <br />The floodways presented in this study were computed for certain <br />stream segments on the basis of equal conveyance reduction from <br />each side of the floodplain. Floodway widths were computed at <br />cross sections. Between cross sections, the floodway boundaries <br />were interpolated. The results of the floodway computations are <br />tabulated at selected cross sections (Table 2). In cases where the <br />floodway and lOO-year floodplain boundaries are either close <br />together or collinear, only the floodway boundary has been shown. <br /> <br />The area between the floodway and IOO-year floodplain boundaries is <br />termed the floodway fringe. The floodway fringe encompasses the <br />portion of the floodplain that could be completely obstructed <br />without increasing the water-surface elevation of the lOO-year <br />flood more than I foot at any point. Typical relationships between <br />the floodway and the floodway fringe and their significance to <br />floodplain development are shown in Figure 2. <br /> <br />I- <br /> <br />100.VEA" FLOOD PLAIN <br /> <br />'I <br /> <br />Ft.OODWAY <br />FAINGE <br /> <br /> <br />FLOOOWAY <br /> <br />FLOOOWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN PLOODWAV <br /> <br /> <br />AAEA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT ev <br />RAISING GROUND <br /> <br /> <br />SURCHARGE- <br />--- <br /> <br />LINE AS IS THE 'LOOD ELEVATION BEFORE ENCAOACHMENT. <br />LINE CO IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />.SU"CHAROE.SNOTTO Exceeo 1.0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />9 <br />