Neco 2019 Geography Question 8

Practice essay / theory question 8 from the 2019 Neco Geography examination. This question covers Drainage, River gradient, Runoff estimation, Human impact on river systems .

Neco 2019 Geography Essay / Theory

Topics: Drainage River gradient Runoff estimation Human impact on river systems

Question 8 NECO • 2019 • GEOGRAPHY • essay

The River Zango drains a catchment area of 3,200 km² in the middle belt of Nigeria. The river originates at an elevation of 1,500 m in the highlands and flows to the Niger River at an elevation of 200 m, covering a length of 120 km. The catchment experiences an average annual rainfall of 1,400 mm, with 60% of the rainfall occurring during the wet season (April–October). The underlying geology consists of alternating layers of sandstone and shale, with the sandstone forming the upper part of the basin. Recent land‑use changes have included extensive deforestation for timber and agriculture.

Question Parts

( a )

Calculate the average gradient of the river in metres per kilometre (m/km) and express it to two decimal places.

( b )

Using the given rainfall data, estimate the total annual volume of water (in cubic metres) contributed by rainfall to the catchment, assuming that 30% of the rainfall becomes direct runoff. Show your working.

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 2019 Geography Question 8. It is one of the essay questions from the 2019 Neco Geography examination.

The question covers Drainage, River gradient, Runoff estimation, Human impact on river systems .

View More Neco 2019 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