Water Development Board (WDB) said water will continue to rise for another three days.
People of 29 unions of Bogura’s Sariyakandi, Sonatola and Dhunot upazilas have already become marooned.
Jute, Aaush paddy, chili and various types of vegetables and Aman seedbed on 8,603 hectares of lands have gone under water. A number of fish enclosures have been flooded and their owners claimed to be have suffered a loss of Tk 2 crore.
The district administration said all preparations have been taken to provide relief materials to about 80,000 people in the three severely affected upazilas.
Meanwhile, Gawsul Ajim Chowdhury, Civil Surgeon of Bogura, said 18 people suffering from various water-borne diseases had been hospitalised.
Twenty-nine medical teams are providing health services in 13 unions of the three upazilas.
According to WDB, the water of Jamuna was flowing 95cm above the danger level at Mothurapara point at noon.
Raihana Islam, ADC of Bogura, said they have taken preparations to protect a 45-kilometre embankment which was built to protect the three upazilas.
Two thousand packets of dry food and 142 metric tons of rice have been allotted as relief.