Laserfiche WebLink
<br />No f100dway was <br />overflow occurs in <br />inadequate channel <br /> <br />computed <br />the reach <br />capacity. <br /> <br />for Dry Gulch Creek because shallow <br />from De1wood Avenue to the mouth due to <br /> <br />The f100dways presented in this study were computed for certain <br />stream segments on the basis of equal conveyance reduction from each <br />side of the floodplain. F100dway widths were computed at cross <br />sections. Between cross sections, the f100dway boundaries were <br />interpolated. The results of the floodway computations have been <br />tabulated at selected cross sections (Table 2). In cases where the <br />floodway and 100-year floodplain boundaries are ei ther close <br />together or collinear, only the f100dway boundary has been shown. <br /> <br />The area between the f100dway and 100-year floodplain boundaries is <br />termed the f100dway 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 flood <br />more than 1.0 foot at any point. Typical relationships between the <br />f100dway and the floodway fringe and their significance to <br />floodplain development are shown in Figure 2. <br /> <br />I- <br /> <br />1 DO-YEAR FLOODPLAIN <br /> <br />-I <br /> <br />- <br /> <br />FLOODWAY <br />FRINGE <br /> <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 />ENCROACHMENT <br /> <br />ENCROACHMENT <br /> <br />- <br />--- <br /> <br /> <br />FLOOD ELEVATION BEFORE <br />ENCROACHMENT ON FLOODPLAIN <br /> <br />AREA OF FLOODPLAIN THAT COULD BE USE'D <br />FOR DE'VELOPME'NT BY RAISING GROUND <br /> <br />LINE' AB IS THE' FLOOD E'LE'V A TION BE'FORE' 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. F100dway Schematic <br /> <br />13 <br />