Neco 2017 Geography Question 8

Practice essay / theory question 8 from the 2017 Neco Geography examination. This question covers Drainage, Runoff, Hydrology .

Neco 2017 Geography Essay / Theory

Topics: Drainage Runoff Hydrology

Question 8 NECO • 2017 • GEOGRAPHY • essay

A small catchment in the Niger Delta covers an area of 25 km². The basin is underlain by impermeable clay. Land‑use distribution is 60 % cultivated land, 30 % forest and 10 % urban. The average annual rainfall is 1500 mm. Runoff coefficients are 0.35 for cultivated land, 0.15 for forest, and 0.70 for urban areas. Assume the rainfall is uniformly distributed throughout the year.

( a )

Calculate the effective runoff coefficient for the whole catchment.

( b )

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

( c )

If a dam is to be constructed to store 20 % of the annual runoff, calculate the required storage capacity in million cubic metres (MCM).

( d )

Discuss two potential impacts—one positive and one negative—of constructing the dam on the drainage system and the surrounding communities.

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This is Neco 2017 Geography Question 8. It is one of the essay questions from the 2017 Neco Geography examination.

The question covers Drainage, Runoff, Hydrology .

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