A composed cross-section channel consists of a deep main channel and two shallow floodplains. The floodplains
(n=0.04)
are rougher than the main channel
(n=0.02)
; so the mean velocity in the main channel is greater than the mean velocities in the floodplains. If the channel has the same slope everywhere
S_(0)=6.6
, estimate the total water discharge ). Answer:
?