The upsurge of Surma river water has inundated Shologhar, Kazir Point, Poshchim Bazar, Shahebbari ghat, Boropara, Mollikpur, Jolilpur and other areas, since Monday morning.
From around 12pm, the water from Surma has been flowing over 95cm above the danger level at Sunamganj's Shologhar point.
Although the torrential rain has lessened, the water is still flowing down from Meghalaya upstream through Surma river.
Waterlogging is weighing heavily on the locals who have been stranded in their homes for a few days.
Around 20,000 houses, in 11 upazilas of Sunamganj, have been flooded.
Moreover, the flood water has damaged around 700 hectares of Aman rice and 5000 hectares of Rupa Aman rice crops.
Sunamganj Water Development Board Executive Engineer Md Abu Bakar Siddique said: “Surma river's water level is increasing abnormally due to the water flowing down from Meghalaya upstream. The water is flowing in a steady speed.”
Meanwhile, the district administration has been distributing packets of dry food, cash money and rice among the people.