Neco Model Questions Vol1 2017 Geography Question 8

Practice essay / theory question 8 from the 2017 Neco Model Questions Vol1 Geography examination. This question covers Drainage .

Neco Model Questions Vol1 2017 Geography Essay / Theory

Topic: Drainage

Question 8 NECO_MODEL_QUESTIONS_VOL1 • 2017 • GEOGRAPHY • essay

The Upper Benue River basin covers an area of 1 200 km². The basin receives a mean annual rainfall of 1 500 mm. Of the total rainfall, 30 % infiltrates into the soil, 40 % is lost to evapotranspiration and the remaining water contributes to surface runoff. A dam situated near the basin outlet stores 0.5 km³ of water for hydro‑electric generation. Using the information above, answer the following:

Question Parts

( a )

Calculate the total annual volume of surface runoff (in cubic metres) generated from the basin, ignoring the water stored in the dam.

( b )

Determine the average annual discharge (in cubic metres per second) from the basin based on the runoff volume obtained in part (a).

( c )

Deforestation in the upper part of the basin reduces infiltration to 25 % of rainfall (a 5 % absolute drop) while other percentages remain unchanged. Re‑calculate the new average discharge and discuss briefly how this change would affect flood risk in downstream communities.

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About This Question

This is Neco Model Questions Vol1 2017 Geography Question 8. It is one of the essay questions from the 2017 Neco Model Questions Vol1 Geography examination.

The question covers Drainage .

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