Civil Engineering > GATE 2021 SET-2 > Hydrology
The hyetograph in the figure corresponds to a rainfall event of 3 cm.
If the rainfall event has produced a direct runoff of 1.6 cm, the ϕ-index of the event (in mm/hour, round off to one decimal place) would be _______.
Correct : 4.2 to 4.2
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