Floods triggered by heavy downpour and onrush of water from the upstream affected parts of three upazilas in Lalmonirhat on Wednesday night.
At least 25,000 families in Hatibandha, Kaliganj and Aditmari upazilas were inundated by the floods.
Water Development Board executive engineer Rabiul Islam said that water gushing from the upstream forced them to open floodgates at the Teesta Barrage following heavy rains for at least a week.
They said that the River Teesta may continue to rise given that rains continued.
Until Thursday evening, the Teesta was flowing 10 cm below the danger level at Dalia and the Dharla was flowing 15 cm below the danger level at Kulaghat.
Hatibandha upazila nirbahi officer Samiul Amin said that the administration is aware of possible dangers and damages and that it is ready to deal with any disaster.
He said that people living in low lying areas had been warned and were asked to remain alert to shift to safer places anytime.
On September 7, the Teesta River overflowed for about a day after India opened its floodgates at Gajaldoba Barrage flooding 63 chars in five upazilas in the district.
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