A natural, meandering, river channel is modified into a more or less straight and smooth, canal- like channel. Which of the following statements is correct?
A) The straight channel has a higher gradient and more friction than the natural channel.
B) The natural channel had a lower gradient and less friction than the modified channel.
C) The natural channel had a lower gradient and higher friction than the straight channel.
D) There was no change in gradient or friction.

Question

Quizplus · Accepted Answer

The natural channel has a lower gradient due to its meandering path, which increases the distance water travels compared to a straight channel, thus reducing the slope. The meanders and roughness of the natural channel also create more friction compared to the smoother, straightened channel.

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