Waec Model Questions Vol1 2018 Geography Question 4
Practice objective / multiple choice question 4 from the 2018 Waec Model Questions Vol1 Geography examination.
A 2.5 km² catchment is 40 % impervious (C=0.85), 30 % residential (C=0.55) and 30 % agricultural (C=0.30). The design storm intensity for a 10‑year return period is 70 mm h⁻¹. Using the Rational Method, calculate the peak discharge (m³ s⁻¹). Then, design a rectangular concrete channel to convey this flow. The channel slope is 0.0015, Manning's n = 0.013, and the chosen depth is 1.2 m. Determine the required channel width (b) to the nearest 0.1 m.
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About This Question
This is Waec Model Questions Vol1 2018 Geography Question 4. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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