Manning roughness coefficients for the composite channel given below are $n_1=0\mathrm{.}013,n_2=0\mathrm{.}017$ and $1\mathrm{.}5m$ long vegetated section has $n_5=0\mathrm{.}023.$ Calculate the discharge passing through the cross$-$section of the channel if the channel bed slope, $S_o=0\mathrm{.}008.$

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