Waec Model Questions Vol1 2023 Geography Question 21
Practice objective / multiple choice question 21 from the 2023 Waec Model Questions Vol1 Geography examination.
A catchment of 0.12 km² is divided into three land uses: residential (40% of the area, runoff coefficient C=0.75), agricultural (30%, C=0.30) and forest (30%, C=0.10). A design storm of 10 minutes has a rainfall intensity of 60 mm h⁻¹. The main drainage channel has a slope of 0.4% and a Manning roughness coefficient n = 0.015. Assuming the runoff can be estimated by the Rational method (Q = 0.00278 C i A, where i is in mm h⁻¹ and A in hectares) and that the pipe will flow full, determine the minimum internal diameter of a circular pipe (in centimetres) required to convey the runoff. Round the answer up to the nearest centimetre.
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About This Question
This is Waec Model Questions Vol1 2023 Geography Question 21. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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