A 12-hour storm occurs over a catchment and results in a direct runoff depth of 100 mm. The time-distribution of the rainfall intensity is shown in the figure (not to scale). The $\phi$-index of the storm is (in mm, rounded off to two decimal places) ____________.

GATE 2023 Civil Engineering Q59 — Civil Engineering

GATE 2023Set 1Q59NATanswer keyexplanation soonmedium

Civil Engineering · Hydrology - Rainfall-Runoff

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Figure from the original GATE 2023 paper. (IIT Kanpur archive)

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Recurring concept

Hydrology - Rainfall-Runoff has appeared in GATE Civil Engineering 4 times across 3 years (2018, 2021, 2023).

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HydrologyRainfallRunoffphi-index