why does Brahmaputra in the Tibetan part have less silt despite a longer course

Q- Why does Brahmaputra in the Tibetan part have less silt, despite a longer course?

Answer- The Brahmaputra river carries a huge water and very less silt in Tibet because it is a very cold and dry area. But after it enter in India, it is fed by heavy rain due to this rain it carries a lots of silt and water.

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