Question

Why does the Brahmaputra in its Tibetan part have less silt, I despite a longer course.​

Answer 1

in its Tibetan part there is hardly any tributaries to the river responsible for creation of high silt deposits.

Answer 2

$\huge\mathfrak\red{ANSWER}$

▪Brahmaputra in its Tibetan part receives very little volume of water so it has less silt there because it has cold and dry climate.