Gce Model Questions Vol1 2019 Geography Question 38

Practice objective / multiple choice question 38 from the 2019 Gce Model Questions Vol1 Geography examination.

Gce Model Questions Vol1 2019 Geography Objective / Multiple Choice Hard Difficulty
Question 38 GCE_MODEL_QUESTIONS_VOL1 • 2019 • GEOGRAPHY • objective

A river descends 600 m over a length of 120 km from source to mouth, giving an original average gradient of \(5\ \text{m km}^{-1}\). A dam is built 30 km downstream of the source, creating a reservoir that raises the upstream water level by 20 m. Determine (a) the original average gradient, (b) the new average gradient of the river downstream of the dam, and (c) the likely effect of this change on the river's downstream erosional capacity.

Answer Options

A. Original gradient = 5 m km⁻¹; new downstream gradient ≈ 5.50 m km⁻¹; the much steeper gradient greatly enhances downstream erosional capacity.
Correct Answer B. Original gradient = 5 m km⁻¹; new downstream gradient ≈ 5.22 m km⁻¹; the steeper gradient increases downstream erosional capacity.
C. Original gradient = 5 m km⁻¹; new downstream gradient ≈ 5.10 m km⁻¹; the slightly steeper gradient has little effect on downstream erosional capacity.
D. Original gradient = 5 m km⁻¹; new downstream gradient ≈ 4.78 m km⁻¹; the gentler gradient decreases downstream erosional capacity.
Correct Answer
B
Correct Option:
Original gradient = 5 m km⁻¹; new downstream gradient ≈ 5.22 m km⁻¹; the steeper gradient increases downstream erosional capacity.

About This Question

This is Gce Model Questions Vol1 2019 Geography Question 38. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Geography examination.

Difficulty level: Hard .

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