Why does the Brahmaputra River flood so frequently in Assam and Bangladesh?

The Brahmaputra River experiences frequent and extensive flooding primarily due to its enormous water volume and the intense seasonal rainfall characteristic of the region.1

In the Assam Valley, the river is enclosed by hill ranges and receives over 100 inches of annual rainfall, which triggers virtually annual flooding during the summer monsoon. This situation is exacerbated by the river's heavy silt load, particularly from northern tributaries flowing down the rain-soaked Himalayan slopes, which influences the river's channel dynamics and contributes to constant erosion and deposition.1

In the Bengal Plain, flooding is further intensified by the massive discharge from major tributaries such as the Tista, Torsa, and Jaldhaka rivers. Additionally, the delta region in Bangladesh is periodically devastated by tidal surges from tropical cyclones originating in the Bay of Bengal, a risk now compounded by rising sea levels linked to global warming.1