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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The three surveyed cross-sections, the one surveyed cross-sections transferred to reaches other <br />than the reach where they were surveyed, the two cross-sections that were hybrids of map cross- <br />sections and field data, and the one cross-section which used FEMA depths from an upstream <br />location are graphically represented in Figures 7A-F. Example rating curves were prepared for <br />the three field-surveyed cross-sections. They are presented in Plates 10-12, after the floodplain <br />maps. <br /> <br />4.5 Delineatinl! Flood Boundaries <br /> <br />The calculated flood depths for the various stream reaches were first plotted on the quadrangle <br />maps at the cross-section locations. The resulting floodplain widths were compared to the <br />floodplain widths on the cross-section plots. The floodplain boundaries betweep. the cross- <br />sections were then approximated by delineating flood depth contours and interpreting the <br />relationship between those flood depth contours and the ground contours. Consideration was <br />given to the slope within each reach. The fmalized information was displayed on the VSOS 7.5' <br />quadrangle maps (scale of 1" = 2,000'). A table identifying the quadrangle maps used in each <br />plate and the map scale is given in Figure 8. The location of each floodplain map plate is shown <br />in Figure 9, and the floodplain maps are shown in Plates 1-9. <br /> <br />19 <br />