Neco Model Questions Vol1 2019 Geography Question 19
Practice objective / multiple choice question 19 from the 2019 Neco Model Questions Vol1 Geography examination.
A small catchment of 12 ha has a runoff coefficient of 0.45. For a 10‑year return‑period storm the design rainfall intensity is 45 mm h⁻¹. (a) Using the Rational method \(Q = C i A\) (with \(Q\) in m³ s⁻¹, \(i\) in mm h⁻¹ and \(A\) in ha), compute the peak discharge. (Use the conversion factor 0.00278.) (b) The engineer decides to convey the flow in a rectangular open channel whose width equals its depth (b = d). The channel slope is 0.001 and Manning's roughness coefficient is 0.015. Using Manning's equation, determine the required width (and depth) of the channel (in metres, to two decimal places).
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About This Question
This is Neco Model Questions Vol1 2019 Geography Question 19. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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