Neco 2023 Geography Question 22
Practice objective / multiple choice question 22 from the 2023 Neco Geography examination.
A catchment area of \(12\) km\(^2\) receives a uniform rainfall of \(45\) mm over a 24‑hour period. Twenty‑five percent of the rainfall is lost to infiltration and evaporation. The remaining runoff is to be conveyed through a rectangular concrete drainage channel that is \(3\) m wide and \(1.5\) m deep. The channel must carry the runoff in \(6\) hours. Assuming Manning's roughness coefficient \(n = 0.015\) and that the channel flows full during the runoff period, determine the minimum slope (as a percentage) required for the channel.
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About This Question
This is Neco 2023 Geography Question 22. It is one of the objective questions from the 2023 Neco Geography examination.
Difficulty level: Medium .
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