The total rainfall in a catchment of area $1000 \mathrm{~km}^{2}$, during a $6 \mathrm{~h}$ storm, is $19 \mathrm{~cm}$. The surface runoff due to this storm computed from triangular direct runoff hydrograph is $1 \times 10^{8} \mathrm{~m}^{3}$. The $\phi_{\text {index }}$ for this storm (in $\mathrm{cm} / \mathrm{h}$, up to one decimal place) is

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The total rainfall in a catchment of area $1000 \mathrm{~km}^{2}$, during a $6 \mathrm{~h}$ storm, is $19 \mathrm{~cm}$. The surface runoff due to this storm computed from triangular direct runoff hydrograph is $1 \times 10^{8} \mathrm{~m}^{3}$. The $\phi_{\text {index }}$ for this storm (in $\mathrm{cm} / \mathrm{h}$, up to one decimal place) is