Question

The rates of rainfall for successive 10 minutes period of a 60 minute duration storm, are shown in the below figure,

If the value of $\varphi$ - index is 3 cm/hour, the runoff will be_____mm. (rounded off to nearest integer)

• A. 30
• B. 15
• C. 45
• D. 60

Answer 1

The correct option is A 30


$R=(3\times \frac{10}{60})+(7\times \frac{10}{60})+(5\times \frac{10}{60})+(3\times \frac{10}{60})=3cm$
R=30 mm