Water flows in a channel whose bottom slope

is $0\mathrm{.}003$ and whose cross section is shown in the

figure. The dimensions and the Manning

coefficients for the surfaces of different

subsections are also given on the figure.

Determine the flow rate through the channel.

a$)77\mathrm{.}49\frac{m^3}{s}$

b$)91\mathrm{.}69\frac{m^3}{s}$

c$)80\mathrm{.}2\frac{m^3}{s}$

d$)98\mathrm{.}03\frac{m^3}{s}$

e$)84\mathrm{.}89\frac{m^3}{s}$