The rates of rainfall for successive 20 min period of 140 minutes are 2.5, 2.5, 10, 7.6, 1.25, and 1.25 and 5 cm/h. Taking the value of phi-index as 3.2 cm/h, the total runoff (in cm) is:

1
6
2
4.33
3
10
4
5

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