Gce Model Questions Vol1 2023 Geography Question 5
Practice objective / multiple choice question 5 from the 2023 Gce Model Questions Vol1 Geography examination.
A catchment has a length of \(L = 2.5\) km and an average slope of \(S = 0.04\) (4 %). The Kirpich formula gives the time of concentration (minutes) as \(T_c = 0.0195\,L^{0.77}\,S^{-0.385}\) with \(L\) in metres. Thirty percent of the catchment is urbanised, and for that portion the effective length is reduced by 15 %. Assuming the overall time of concentration is the area‑weighted average of the urban and rural portions, calculate the effective \(T_c\) for the whole catchment (rounded to one decimal place).
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This is Gce Model Questions Vol1 2023 Geography Question 5. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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