The 'time of concentration' (Tc) of a catchment in hydrology is defined as:
Choose the correct answer
Time for flood peak to reduce to half
Time for water from the most remote point to reach the outlet — when all catchment contributes to runoff
Duration of rainfall
Time for soil to reach saturation
Correct Answer
B. Time for water from the most remote point to reach the outlet — when all catchment contributes to runoff
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Tc = time for water to flow from the hydraulically most remote point of the catchment to the outlet (combining overland flow + channel flow time). After Tc, all the catchment area contributes to runoff at the outlet (peak runoff condition). Used in Rational Method (design storm duration = Tc). Computed by Kirpich formula: Tc = 0.0195 × L^0.77/S^0.385.
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