The drainage coefficient of a watershed of 720 ha area is $1.2 \mathrm{~cm}$.The design discharge of the drain in $\mathbf{m}^{3}\mathbf{s}^{-1}$ is__

The drainage coefficient of a watershed of 720 ha area is $1.2 \mathrm{~cm}$.The design discharge of the drain in $\mathbf{m}^{3}\mathbf{s}^{-1}$ is__

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