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Question
The river channels in the lower course are wider than the upper course.
Short/Brief Note
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Solution
- In the lower course of the river, the gradient is gentler than in the upper course.
- The river has more energy and the volume amount of water is high.
- In the lower course, there is more lateral (sideways) erosion.
- The channel is wide and deep.
- The river has less friction to overcome which means that the river can flow faster.
- As the river erodes sideways, it swings from side to side forming large bends called meanders.
- Erosion is the most dominant action of river in the upper course.
- In the lower course, the river moving down stream across a broad, level plain is loaded with debris brought down from its upper and middle courses.
- Therefore the river channels are wider in the lower course compared to the upper course.
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