Bangladesh is a riverine country. In the annual "Normal Flood" about 18% of the country is flooded. Bangladesh Water Development Board is mandated to protect land from flood .

By Zone.

1. BWDB Southern Zone, Barisal
2. BWDB North-Western Zone, Rajshahi
3. BWDB Northern Zone, Rangpur
4. BWDB South-Western Zone, Faridpur
5. BWDB Central Zone, Dhaka
6. BWDB South-Eastern Zone, Chittagong
7. BWDB North-Eastern Zone, Comilla