Neco Model Questions Vol1 2023 Geography Question 8

Practice essay / theory question 8 from the 2023 Neco Model Questions Vol1 Geography examination. This question covers Drainage .

Neco Model Questions Vol1 2023 Geography Essay / Theory

Topic: Drainage

Question 8 NECO_MODEL_QUESTIONS_VOL1 • 2023 • GEOGRAPHY • essay

A drainage basin in the northern Guinea savanna covers an area of 150 km². The underlying soil is sandy loam with a runoff coefficient of 0.25. The average annual rainfall is 1 200 mm, but a storm event of 30 mm in 2 hours is expected during the rainy season. The main channel is 12 km long and has an average slope of 0.02.

Question Parts

( a )

Using the rational method, calculate the peak discharge (in m³ s⁻¹) for the storm event. Show all steps and state any assumptions you make.

( b )

Classify the stream order of the main channel using the Strahler method, assuming the basin contains 8 first‑order streams that join to form second‑order streams, and so on. Explain your reasoning.

( c )

Discuss two potential adverse effects of the high peak discharge on downstream settlements and agriculture.

( d )

Recommend two sustainable drainage practices suitable for this basin and explain how each practice would reduce the peak discharge.

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About This Question

This is Neco Model Questions Vol1 2023 Geography Question 8. It is one of the essay questions from the 2023 Neco Model Questions Vol1 Geography examination.

The question covers Drainage .

View More Neco Model Questions Vol1 2023 Geography Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

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