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<br />The floodway for this study was computed on the basis of equal con- <br />veyance reduction from. each side of the flood plain. The results of <br />these computations are tabulated at selected cross sections for each <br />stream segment for which a floodway is computed (Table 2). <br /> <br />v <br /> <br />As shown on the Flood Boundary and Floodway Map (Exhibit 2), the <br />floodway boundaries were determined at cross sections; between cross <br />sections, the boundaries were inter~olated. In cases where the <br />floodway and 100-year flood boundaries are close together, only the <br />floodway boundary has been shown. <br /> <br />The area between the floodway and the boundary of the 100-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 100-year flood <br />more than 1.0 foot at any point. Typical relationships between the <br />floodway and the floodway fringe and their significance to flood <br />plain development are shown in Figure 2. <br /> <br />\- <br /> <br />10Q-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 />I <br />I'.: <br />",\ <br />b";; <br />I <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOOOWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />... <br />FLOOD ELEVATION <br />BEFOREENCADACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS 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. Floodway Schematic <br /> <br />9 <br />