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<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 flood plain. Between cross sections, the floodway <br />boundaries were interpolated. The results of computations are <br />tabulated at selected cross sections (Table 2). In cases where <br />the floodway and lOa-year flood plain boundaries are either close <br />together or collinear, only the floodway boundary has been shown. <br />Floodway data were not provided for Dry Creek and its tributaries, <br />or for Pine Creek OVerflow. <br /> <br />The area between the floodway and laO-year flood plain boundaries <br />is termed thefloodway fringe. The floodway fringe encompasses <br />the portion of the flood plain that could be completely obstructed <br />without increasing the water-surface elevation of the lOa-year <br />flood by more than 1.0 foot at any point. Typical relationships <br />between the floodway and the floodway fringe and their significance <br />to flood plain development are shown in Figure 2. <br /> <br />Ie <br /> <br />100-YEAR FLOOD PLAIN <br /> <br />.., <br /> <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 />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />LINE AB IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />.SURCHARGE ISNOTTO EXCEED 1.0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />23 <br /> <br />