Laserfiche WebLink
<br />The floodways presented in this study <br />stream segments on the basis of equal <br /> <br />were computed for certain <br />conveyance reduction from <br /> <br />sections. Between cross sectlons, tne tloodway boundarles <br />interpolated. The results of the floodway computations <br />tabulated for selected cross sections (Table 4). In cases <br />the floodway and 100-year floodplain boundaries are either <br />together or collinear, only the floodway boundary is shown. <br /> <br />were <br />are <br />where <br />close <br /> <br />The area between the floodway and 100-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 100-year <br />flood more than 1.0 foot at any point. Typical relationships <br />between the floodway and the floodway fringe and their significance <br />to floodplain development are shown in Figure 5. <br /> <br />I- <br /> <br />100,YEAR FLOODPLA,N <br /> <br />-I <br /> <br />. <br /> <br />FLOODWAY <br />FR'NGE <br /> <br />- <br /> <br />FLOODWAY <br /> <br />LOODWAY <br />FRINGE <br /> <br />STREAM _ <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITH'N FlOODWAY <br /> <br /> <br />ENCROACHMENT <br /> <br />ENCROACHMENT <br /> <br />AREA OF FLOODPLA,N THAT COULD BE USED FOR <br />DEVELOPMENT BY RA'SING GROUND <br /> <br /> <br /> <br />FLOOD ELEVAT,ON BEFORE <br />ENCROACHMENT ON FLOODPLA,N <br /> <br />LINE AB IS THE FLOOD ELEVAT'ON BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />'SURCHARGE 'S NOTTO EXCEED 10 FOOT (FIA REQU'REMENT) OR LESSER AMOUNT 'F SPEClF'ED BY STATE. <br /> <br />Figure 5. Floodway Schematic <br /> <br />26 <br />