Waec Model Questions Vol1 2022 Geography Question 8

Practice essay / theory question 8 from the 2022 Waec Model Questions Vol1 Geography examination. This question covers Drainage .

Waec Model Questions Vol1 2022 Geography Essay / Theory

Topic: Drainage

Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2022 • GEOGRAPHY • essay

A catchment in northern Nigeria covers 250 km², receives an average annual rainfall of 1200 mm, of which 40 % contributes to direct runoff. The soil infiltration rate during storm events is 12 mm hr⁻¹ and the catchment displays a dominant dendritic drainage pattern.

Question Parts

( a )

Calculate the average annual runoff volume (in cubic metres) generated from the catchment.

( b )

Estimate the peak discharge (in m³ s⁻¹) for a design storm lasting 2 hours using the Rational Method. Show all steps and state any assumptions made.

( c )

Discuss how a change from the present dendritic pattern to a trellis drainage pattern would influence flood risk and groundwater recharge in the catchment.

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About This Question

This is Waec Model Questions Vol1 2022 Geography Question 8. It is one of the essay questions from the 2022 Waec Model Questions Vol1 Geography examination.

The question covers Drainage .

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