At least five people have died and more than 100,000 remain stranded as devastating floods, triggered by heavy rains and upstream torrents, continue to ravage northern Bangladesh, officials said on Sunday. In Sherpur, one of the hardest-hit northern districts, the water levels of major rivers have surged, submerging new areas and displacing thousands of families. Army personnel, using boats and helicopters, have joined rescue efforts, delivering emergency supplies and evacuating those trapped by the floods. The floods in August in eastern Bangladesh, which left more than 70 dead, caused damage estimated at $1.20 billion, according to a study by the Centre for Policy Dialogue, a leading think-tank. The United Nations and its partners have launched a $134 million humanitarian appeal to provide urgent relief and support to communities affected by ongoing floods and cyclones in Bangladesh.