The western region of the deltaic lobe receives the snowmelt
water of Himalayan glaciers after being regulated through several
dams on the way. The central region on the other hand, is fully
deprived from such supply due to heavy siltation and clogging of
the Bidyadhari channel in the late 15th century (Chaudhuri and
Choudhury, 1994). The substrate of the Indian Sundarbans is mostly