This problem involves a channel and overbank area which need to convey a given design flood. The unknown in this problem is the width of the overbank needed such that the depth in the channel does not exceed a certain value. There are two given Manning’s n values for the channel and overbank area.
HINT: Separate the main channel and overbank areas into two rectangular cross-sections, and be careful when you compute the wetted perimeter, including only the parts of the channel and overbank that are wetted.
Dr. Beth Sciaudone’s Solution to NCEES PE Civil: Water Resources/Env Problem 510
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