The 'time of concentration' (Tc) of a watershed is the time for water to flow from:
Choose the correct answer
Centre of catchment to outlet only
Hydraulically most remote point to outlet — determines design storm duration for peak runoff calculation
Rain gauge to nearest stream
Nearest town to the dam
Correct Answer
B. Hydraulically most remote point to outlet — determines design storm duration for peak runoff calculation
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Time of concentration Tc: time for runoff to travel from the hydraulically most remote point in the catchment to the outlet. Used in: Rational method (design intensity = IDF intensity for duration = Tc). Components: overland flow time + channel flow time. Methods: Kirpich formula (Tc in min = 0.0195 L^0.77 S^-0.385), kinematic wave, Manning-based. Shorter Tc → more intense design storm.
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