Bangladesh is one of the largest deltas in the world formed by a dense network of tributaries and distributaries of the mighty rivers- Ganga, Bhramaputra, and the Meghna. The country largely comprises low and flat land and is exposed to monsoon flooding for part or whole of the year. Coastal plains are experience cyclones, storm surges and inundation. About 80 percent of the land is categorised as flood plains. And river erosion is common. (MoEF, 2009)