The top width and the depth of flow in a triangular channel were measured as $4 \mathrm{~m}$ and $1 \mathrm{~m}$, respectively. The measured velocities on the centre line at the water surface, $0.2 \mathrm{~m}$ and $0.8 \mathrm{~m}$ below the surface are $0.7 \mathrm{~m} / \mathrm{s}, 0.6 \mathrm{~m} / \mathrm{s}$ and $0.4 \mathrm{~m} / \mathrm{s}$, respectively. Using two-point method of velocity measurement, the discharge (in $\mathrm{m}^{3} / \mathrm{s}$ ) in the channel is
(A) 1.4
(B) 1.2
(C) 1.0
(D) 0.8
The top width and the depth of flow in a triangular channel were measured as $4 \mathrm{~m}$ and $1 \mathrm{~m}$, respectively. The measured velocities on the centre line at the water surface, $0.2 \mathrm{~m}$ and $0.8 \mathrm{~m}$ below the surface are $0.7 \mathrm{~m} / \mathrm{s}, 0.6 \mathrm{~m} / \mathrm{s}$ and $0.4 \mathrm{~m} / \mathrm{s}$, respectively. Using two-point method of velocity measurement, the discharge (in $\mathrm{m}^{3} / \mathrm{s}$ ) in the channel is
(A) 1.4
(B) 1.2
(C) 1.0
(D) 0.8