Waec Model Questions Vol1 2019 Geography Question 8

Practice essay / theory question 8 from the 2019 Waec Model Questions Vol1 Geography examination. This question covers Drainage .

Waec Model Questions Vol1 2019 Geography Essay / Theory
Topic: Drainage
Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • GEOGRAPHY • essay

A river basin in the northern part of Nigeria has the characteristics shown in the table. | Parameter | Value | |-----------------------------------|-------------------------------------| | Length of main river (L) | 120 km | | Elevation at source (Es) | 800 m above sea level | | Elevation at mouth (Em) | 500 m above sea level | | Basin area (A) | 2 000 km² | | Mean annual rainfall (R) | 1 500 mm | | Discharge at upstream station (Q₁)| 15 m³/s | | Discharge at mid‑stream station (Q₂)| 45 m³/s | | Discharge at downstream station (Q₃)| 120 m³/s | Using this information, answer the following questions:

Question Parts

( a )
Calculate the average gradient of the river in metres per kilometre (m/km).
( b )
Using the rational method, estimate the peak discharge (Qₚ) for the basin. Assume a runoff coefficient C = 0.6 and a design rainfall intensity I = 30 mm h⁻¹ acting over the entire basin. Show all steps.
( c )
Discuss two flood‑mitigation measures that would be appropriate for this basin, linking each measure to the calculated gradient and peak discharge.

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About This Question

This is Waec Model Questions Vol1 2019 Geography Question 8. It is one of the essay questions from the 2019 Waec Model Questions Vol1 Geography examination.

The question covers Drainage .

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