More than 53,500 people were staying in various relief camps across the state.
Four teams of the National Disaster Response Force left from Chennai to Kerala.
Col. Ajai Sharma, the commandant of DSC Centre, who is overseeing relief and rescue operations, said five columns of Army have been deployed in the northern districts since Thursday night.
The Indian Navy's southern command has been put on alert after the water level in Periyar river rose amid concerns that parts of Willingdon Island in Kochi could be inundated.
With several rivers in spate following the incessant rains, as many as 24 dams in different parts of the state have been opened in an "unprecedented" development.
Almost 400 flood-affected people, including 85 children from Keerithod in Kanjikuzhy panchayat near Cheruthoni have been in a camp for the past two days as a precautionary measure after water was released from Idukki dam.
Tincy, a panchayat member said as prior warning about the release of water had been issued, any kind of human casualty was avoided.
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At least 30 tourists, including foreigners stranded at the Plum Judy resort at Munnar since Wednesday as roads are blocked due to landslips, are safe and the Army's help has been sought, state Tourism minister Kadakampally Surendran said, adding they will be shifted to the KTDC. Home Minister Rajnath Singh is set to visit and make an aerial survey of flood-hit areas on Sunday while his deputy, Kiren Rijiju, has already been to the rain-battered state.
The chopper of the chief minister could not land at Kattappana in Idukki due to bad weather.
Meanwhile, Congress President Rahul Gandhi appealed to Congress workers to "step in and volunteer for relief operations of the affected regions". "My prayers & thoughts are with the people of Kerala in this hard time".
As per data, districts like Ernakulam, Idukki, Kottayam, Malappuram and Palakkad have registered excess cumulative rainfall between June 1 and August 10.
Talking to reporters after a review meeting, Chief Minister Pinarayi Vijayan said the flood situation in the state was "very grim" and it was for the first time in the history of the state that 22 dams have been opened at a time following the water level reaching its maximum capacity.
PH Kurian, KSDMA's chief and a top state bureaucrat, said rains had eased. The South-West monsoon has been vigorous over Kerala, resulting in heavy rains in various parts of the state for the last two days.
The government of Kerala, which has a population of 33 million people, has imposed a ban on the movement of lorries and tourist vehicles in Idukki. Bridges have been constructed to evacuate stranded people in various places in Kozhikode and Wayanad areas, and rescue operations are now underway.