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Why is it incomplete to link floods in the Ganga-Brahmaputra system only with heavy rainfall?

Answer and explanation

Correct answer: Because sediment, flat slope and channel shifting also increase floods

The direct answer is A: sediment, flat slope and channel shifting also increase floods. Heavy rain is important, but it is only one link in the flood chain. The Ganga-Brahmaputra rivers carry a great quantity of sediment from the mountains. When this sediment settles in a river channel, the channel becomes shallower and holds less water. The broad plains have a very gentle slope, so water moves slowly and spreads widely. Rivers may also change their channels, making water enter new areas. A is correct because it names these additional causes. B is wrong because both systems receive rainfall. C is wrong because these rivers flow from mountains into the plains and do not end only in mountains. D is wrong because they have many tributaries, which add water. Exam cue: explain floods through rainfall plus sediment, flat land and channel change.

Related tags

FloodsGanga BrahmaputraSediment

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