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Why is it incomplete to explain Brahmaputra floods in Assam only by rainfall?

Answer and explanation

Correct answer: Because sediment load slope and wide plains also influence it

Rainfall is an important cause of floods in Assam, but it does not explain the whole situation of the Brahmaputra. The river receives water from a large basin, including areas with heavy monsoon rain and snowmelt in the upper mountains. It also carries a very large sediment load. Sediment can raise or fill parts of the channel, reducing the space available for water. In addition, the low and wide plains of Assam allow water to spread easily when the river rises.

Option A is correct because flood intensity results from several connected factors: rainfall, runoff, sediment load, channel conditions, slope, and the shape of the floodplain. A wide plain may permit extensive spreading, while deposited sediment can make the channel shallower. Therefore, explaining the floods only through rainfall is incomplete. The other choices are clearly false: Assam has major rivers, the Brahmaputra is not always dry, and the sea does not directly reach Assam as the cause of these floods.

Related tags

Brahmaputra FloodsAssamSediment

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