A trapezoidal grassed waterway is constructed along a longitudinal gradient of $4 \% .$ If the crosssectional area of flow is $1.52 \mathrm{~m}^{2}$, wetted perimeter is $12.5 \mathrm{~m}$ and Manning's $n$ for the waterway is $0.04 \mathrm{~m}^{-1 / 3} \mathrm{~s}$, the flow through the waterway in $\mathrm{m}^{3} \mathrm{~s}^{-1}$ is

(A) 1.9

(B) 2.1

(C) 2.3

(D) 2.5

A trapezoidal grassed waterway is constructed along a longitudinal gradient of $4 \% .$ If the crosssectional area of flow is $1.52 \mathrm{~m}^{2}$, wetted perimeter is $12.5 \mathrm{~m}$ and Manning's $n$ for the waterway is $0.04 \mathrm{~m}^{-1 / 3} \mathrm{~s}$, the flow through the waterway in $\mathrm{m}^{3} \mathrm{~s}^{-1}$ is

(A) 1.9

(B) 2.1

(C) 2.3

(D) 2.5

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