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<br />The floodway for this study was computed on the basis of equal con- <br />veyance from each side of the flood plain. The results of these <br />computations are tabulated at selected cross sections for each stream <br />segment for which a floodway is computed (Table 2). <br /> <br />As sho'Wl1 on the Flood Boundary and Floodway r1ap (Exhibit 2), the <br />floodway boundaries were deterrnaned at cross sections; betwee~-cross <br />sections, the boundaries were interpolated. In cases where the <br />floodway and IOO-year flood boundaries are close together, only the <br />floodway boundary has been shown. <br /> <br />The area between the floodway and t~e boundary of the IOO-year flood <br />is termed the floodway fringe. The floodway fringe thus encompasses <br />the portion of the flood plain that could be completely obstructed <br />without increasing the water-surface elevation of the IOO-year flood <br />more than 1.0 foot at any point. Typical relationships between the <br />floodway and floodway fringe and their significance to flood plain <br />development are shown in Figure 7. <br /> <br />I, <br /> <br />100-YEAR FLOOD PLAIN <br /> <br />'I <br /> <br />F LOODWA Y <br />F RING E <br /> <br /> <br />FLQODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STR EAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLODDWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br /> <br />o <br /> <br />SURCHARGE- <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 7. <br /> <br />Floodway Schematic <br /> <br />10 <br />