Neco 2018 Geography Question 8

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

Neco 2018 Geography Essay / Theory

Topic: Drainage

Question 8 NECO • 2018 • GEOGRAPHY • essay

A river basin in the southwestern part of Nigeria has the following characteristics: - Catchment area: 250 km² - Mean annual rainfall: 1500 mm - Design storm rainfall intensity for a 10‑year return period: 80 mm h⁻¹ (assumed constant over the storm duration) - Runoff coefficient (C): 0.45 (reflecting mixed land use) - The river exhibits a trellis drainage pattern, flowing through alternating bands of resistant sandstone and softer shale. Answer the following questions:

Question Parts

( a )

Using the rational method, calculate the design peak discharge (in m³ s⁻¹) for the basin. Show all steps, including any unit conversions required.

( b )

Explain why the basin displays a trellis drainage pattern, linking the pattern to the underlying geology and topography described above.

( c )

Propose two engineering measures that could be implemented to reduce flood risk in the basin, taking into account the calculated peak discharge and the trellis drainage pattern.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

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

The question covers Drainage .

View More Neco 2018 Geography Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support