Thousands of villagers in Bihar's Rohtas and Arwal districts were marooned on Sunday following the sudden release of water from dams in Madhya Pradesh and Uttar Pradesh.
Bansagar Dam in MP and Rihand Dam in UP released 12,500 cusecs of water on Friday as heavy rains continued to lash catchments areas of the Sone and Ganga rivers.
"The release of more water has taken the total release to 8.39 lakh cusecs causing a flood-like situation. However, the water level has been decreasing since Sunday morning," said Afzal Amanullah Amanullah, principal secretary of the water resources department.
Bihar CM Nitish Kumar held an emergency meeting with the disaster management department and directed officials to launch rescue operation on a war footing. He also undertook an aerial survey of the affected areas of Aurangabad, Arwal, Patna, Rohtas, Bhojpur and districts.
In Orissa, 16 people were killed as nearly 2,600 villages were submerged due to high flood in the Mahanadi river. The state has stepped up relief operations for 1.1 billion affected people.
"Two naval helicopters have been pressed into service," Orissa CM Naveen Patnaik said.