Discharge কী?

Example 8.5 (A gauging)

In the stream of the figure, the five strips, each $2\,\mathrm{m}$ wide, have areas $2 \times 0.4 = 0.8$, $2.0$, $2.8$, $2.2$ and $1.0\,\mathrm{m}^{2}$: the cross-section is $8.8\,\mathrm{m}^{2}$. Their discharges are $0.3 \times 0.8 = 0.24$, $0.6 \times 2.0 = 1.20$, $0.8 \times 2.8 = 2.24$, $0.7 \times 2.2 = 1.54$ and $0.4 \times 1.0 = 0.40\,\mathrm{m}^{3}/\mathrm{s}$, so the stream carries $Q \approx 5.6\,\mathrm{m}^{3}/\mathrm{s}$. The mean velocity is $5.62/8.8 \approx 0.64\,\mathrm{m}/\mathrm{s}$, less than the $0.8\,\mathrm{m}/\mathrm{s}$ of the middle of the stream.