Neco 2017 Geography Question 25
Practice objective / multiple choice question 25 from the 2017 Neco Geography examination.
An ungauged catchment has a total area of 12 km\(^2\) consisting of 3 km\(^2\) forest with runoff coefficient \(C_f = 0.15\) and 9 km\(^2\) agricultural land with runoff coefficient \(C_a = 0.30\). A design storm of 30\,minutes duration has an intensity of 80 mm h\(^{-1}\). The main channel length is 2.5 km and its average slope is 0.02. Using the Kirpich formula \(T_c = 0.0195 L^{0.77} S^{-0.385}\) (with \(L\) in metres and \(S\) dimensionless) to estimate the time of concentration, and then applying the rational method \(Q = \frac{C i A}{360}\) (where \(i\) is in mm h\(^{-1}\) and \(A\) in km\(^2\)), determine the peak discharge \(Q\) in m\(^3\) s\(^{-1}\).
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About This Question
This is Neco 2017 Geography Question 25. It is one of the objective questions from the 2017 Neco Geography examination.
Difficulty level: Medium .
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