Heavy rain coupled with onrush of hillwater has triggered flash flood in vast areas of Sunamganj including the district headquarters.
Flood Control Cell of Sunamganj WDB said the Surma was flowing 57cm above the danger level near the district yesterday.
Floodwater engulfed low-lying areas of the district town and Sadar and Tahirpur upazilas, rendering 500 families marooned.
Besides, three other upazilas- Biswambharpur, Doarabazaar and Jamalganj-were hit five days ago.
A big portion of Sunamganj, including Barapara, Pashchim Bazaar, Maachh Bazaar, Shologhar and Nabinagar under Sadar Upazila , Nowapara, Mohabbatpur, Chokbazaar, Payekpara, Lakhipur, Kushiura and Voktarpur under Doarabazaar Upazila and Maharam, Lakmar,
 Lamakata under Tahirpur, two villages in Biswambharpur Upazila went under water as the rain continued, they added.
Abdul Alim, 58, of Lakhipur village in Duarabazaar upazila, said the flood was triggered by heavy rain in the last two days.
“Water from Surma started to enter our home since Saturday evening”, he said.
Saud Ahmed, executive engineer of Water Development Board (WDB) in Sunamganj, said water level at different points of the Surma would cross the danger level within 72 hours if the rain continues. He said floodwater submerged around 25 villages in the district.
Debojit Singha, additional deputy commissioner (revenue) of Sunamganj, said they informed the higher authorities about the matter.