An estimated 30,000 people in five upazilas of Sherpur were stranded as the water level in the rivers continued to rise.
An elderly woman drowned at Sarikalinagar of Jhenigati upazila while erosion in six rivers intensified on Tuesday.
The deceased is Ashia Begum of the area. The death toll from the ongoing flood has risen to three with Ashia's death.
Hundreds of houses were swallowed by Brahmaputra, Moharashi, Someshwari, Vogai, Malijhi and Mrigi rivers.
A 200 feet stretch of an embankment at Rajarkhalpar of Nalitabari upazila and 400 feet in Fakirpara area collapsed, flooding seven villages.
The Water Development Board said it is trying to protect the embankment by using GO bags.
Meanwhile, 49 educational institutions were closed in Jhenigati, Nalitabari and Sherpur sadar upazila.
Sherpur police superintendent Kazi Ashraful Azim visited the flood-hit areas and distributed reliefs.