9468

• UCREFRP Catalog Number: 9468
• Author: Colorado Water Conservation Board.
• Title: Floodplain Information Report\
• USFW Year: 1995.
• Copyright Material: NO

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