BIWTA authority started dredging work to increase the navigability at Brahmaputra River at Langalbandh in N’ganj on Sunday. New Nation Published: 12:00 AM, 12 October 2015 Updated: 10:43 AM, 24 September 2022 BIWTA authority started dredging work to increase the navigability at Brahmaputra River at Langalbandh in N'ganj on Sunday.