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This function plots a cross-section of a (trapezoid, rectangle, triangle), shaded as filled to the level indicated by the values passed to it.
xc_trap(y = NULL, b = NULL, m = NULL)
water depth
bottom width
side slope (H:1)
a cross-section diagram
# NOT RUN { # Draw a cross-section with depth 1, width 2, side slope 3:1 (H:V) xc_trap(y = 1.0, b = 2.0, m = 3.0) # }
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