A triangular direct runoff hydrograph due to a storm has a time base of 90 hours. The peak flow of $60 \mathrm{~m}^{3} / \mathrm{s}$ occurs at 20 hours from the start of the storm. The area of catchment is $300 \mathrm{~km}^{2}$. The rainfall excess of the storm (in $\mathrm{cm}$ ), is

(A) 2.00

(B) 3.24

(C) 5.40

(D) 6.48

A triangular direct runoff hydrograph due to a storm has a time base of 90 hours. The peak flow of $60 \mathrm{~m}^{3} / \mathrm{s}$ occurs at 20 hours from the start of the storm. The area of catchment is $300 \mathrm{~km}^{2}$. The rainfall excess of the storm (in $\mathrm{cm}$ ), is

(A) 2.00

(B) 3.24

(C) 5.40

(D) 6.48

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