GATE 2021 AR – Question 22

Infrastructure, Services and Utilities · Surface water runoff estimate, Discharge from streams and rivers · 1 mark · Multiple choice

Which two components form time of concentration in the stormwater context given?

Overland flow time and retention time
Overland flow time and gutter flow time
Detention time and gutter flow time
Retention time and inlet time

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Show answer and explanation

Correct answer: (B) Overland flow time and gutter flow time

Explanation

Runoff first crosses the contributing surface, then travels through the collecting gutter/channel to the point of interest. These travel-time components give B. Detention or retention storage times are not interchangeable with those runoff travel times.

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