Hydromechanics problem.

Manning roughness coefficients for the composite channel given below are $n_f=0\mathrm{.}013,n_7=0\mathrm{.}017$ and $1\mathrm{.}5$m long vegetated section has $n=0\mathrm{.}023.$ Calculate the discharge passing through the cross$-$section of the channel if the channel bed slope, $S_0=0\mathrm{.}008.$Thumbs up is guarranteed