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<br />I <br />I <br />~. <br /> <br />The floodways proposed for this study were computed on the basis of <br />equal conveyance reduction from each side of the flood plain or en- <br />croachment to the stream banks. The results of these computations <br />are tabulated at selected cross sections for Clear Creek (Table 1). <br />As shown on the Flood Boundary and the Floodway Map, the floodway <br />boundaries were determined at cross sections; between cross sections <br />the boundaries were extrapolated. <br /> <br />The area between the floodway and the boundary of the IOO-year <br />flood is termed the floodway fringe. The floodway fringe thus <br />encompasses the portion of the flood plain that could be com- <br />pletely obstructed without increasing the water surface elevation <br />of the IOO-year flood more than one foot at any point. Typical <br />relationships between the floodway and the floodway fringe and <br />their significance to flood plain development are shown on Figure <br />3 below. <br /> <br />I, <br /> <br />100 YEAR FLOOD PLAIN <br /> <br />'I <br /> <br />FLOODWAY <br />fRINGE <br /> <br /> <br />FLOODWAV <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 OEVELOPMENT BY <br />RAISING GROUND <br /> <br /> <br />LINE A .8ISTHE FLOOD ELEVATION BEFORE ENCROACHMENT <br />LINE c. 0 ISTHE FLOOD ELEVATION AFTER ENCROACHMENT <br /> <br />. <br /> <br />Figure 3 <br /> <br />PRELIMINARY <br /> <br />19 <br />