The drainage area of a watershed is $50 \mathrm{~km}^{2}$. The $\phi$ index is $0.5 \mathrm{~cm} /$ hour and the base flow at the outlet is $10 \mathrm{~m}^{3} / \mathrm{s}$. One hour unit hydrograph (unit depth $=1 \mathrm{~cm}$ ) of the watershed is triangular in shape with a time base of 15 hours. The peak ordinate occurs at 5 hours. For a storm of depth of $5.5 \mathrm{~cm}$ and duration of 1 hour, the peak ordinate (in $\mathrm{m}^{3} / \mathrm{s}$ ) of the hydrograph is

(A) 55.00

(B) 82.60

(C) 92.60

(D) 102.60

The drainage area of a watershed is $50 \mathrm{~km}^{2}$. The $\phi$ index is $0.5 \mathrm{~cm} /$ hour and the base flow at the outlet is $10 \mathrm{~m}^{3} / \mathrm{s}$. One hour unit hydrograph (unit depth $=1 \mathrm{~cm}$ ) of the watershed is triangular in shape with a time base of 15 hours. The peak ordinate occurs at 5 hours. For a storm of depth of $5.5 \mathrm{~cm}$ and duration of 1 hour, the peak ordinate (in $\mathrm{m}^{3} / \mathrm{s}$ ) of the hydrograph is

(A) 55.00

(B) 82.60

(C) 92.60

(D) 102.60

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