Question: 4 . 2 3 . Consider the drainage channel and adjacent floodplains shown in Figure 4 . 2 0 . The Manning roughness coeffi -

4.23. Consider the drainage channel and adjacent floodplains
shown in Figure 4.20. The Manning roughness coeffi-
cients are given by:
and the longitudinal slope is 0.5%. Field tests have
shown that the Horton (1933) equation best describes
the composite roughness of the channel. Find the capac-
ity of the main channel and the lateral extent of the
floodplains for a 100-year flow of 1590m3s.
4 . 2 3 . Consider the drainage channel and

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