Neco Model Questions Vol1 2018 Geography Question 8

Practice essay / theory question 8 from the 2018 Neco Model Questions Vol1 Geography examination. This question covers Drainage .

Neco Model Questions Vol1 2018 Geography Essay / Theory

Topic: Drainage

Question 8 NECO_MODEL_QUESTIONS_VOL1 • 2018 • GEOGRAPHY • essay

The River Y basin in the middle belt of Nigeria covers an area of 250 km². The basin receives a mean annual rainfall of 1 500 mm and loses 800 mm per year to evaporation. The infiltration coefficient for the basin is 0.30. Observations show that during the rainy season the river reaches a peak discharge of 120 m³ s⁻¹. For a design storm of 50 mm rainfall lasting 2 hours, the runoff coefficient is taken as 0.50 and the time of concentration for the basin is 1.5 hours.

Question Parts

( a )

Estimate the mean annual runoff volume (in cubic metres) generated from the basin.

( b )

Using the rational method, estimate the peak discharge (in m³ s⁻¹) for the design storm, assuming the rainfall intensity is uniformly distributed over the time of concentration.

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About This Question

This is Neco Model Questions Vol1 2018 Geography Question 8. It is one of the essay questions from the 2018 Neco Model Questions Vol1 Geography examination.

The question covers Drainage .

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