Question.
Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
( Chapter - 3 Drainage, Cass 9 NCERT Contemporary India -I )
Answer.
Brahmaputra river rises from near Mansarovar lake in Tibet. In Tibet, it is known as Yarlung Tsangpo; in Arunachal Pradesh, it is known as Siang/Dihang; in Assam and the rest of India, it is known as Brahmaputra river; in Bangladesh, it is known as Jamuna.
The total course of the Brahmaputra river is about 2900 km; in Tibet, it is above 1600 km; in India, it is 916 km.
The Brahmaputra in its Tibetan part has less silt, despite a longer course( 1600 km) because of the following reasons:
In Tibet, the Brahmaputra river carries a smaller volume of water and silts as it passes through cold and dry areas.
In Tibet, there is very less rainfall as compared to North-Eastern states.
In India, many tributaries of the Brahmaputra like Lohit, Dibang, and Subansiri bring huge silts from the Himalayan region.
For the above reasons, the Brahmaputra in its Tibetan part has less silt, despite a longer course of 1600 km.
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