Neco Model Questions Vol1 2017 Geography Question 1
Practice objective / multiple choice question 1 from the 2017 Neco Model Questions Vol1 Geography examination.
An urban catchment of \(2.5\ \text{km}^2\) has \(40\%\) impervious area with runoff coefficient \(0.9\) and \(60\%\) pervious area with coefficient \(0.3\). A design storm of \(80\ \text{mm h}^{-1}\) lasting 10 minutes is expected. The slope of the drainage conduit is \(0.001\) and the Manning roughness coefficient is \(n = 0.013\). Using the Rational method to find the peak discharge and then Manning's equation for a full circular pipe, determine the minimum internal diameter (in metres, to one decimal place) of the pipe required to convey the runoff.
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About This Question
This is Neco Model Questions Vol1 2017 Geography Question 1. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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