Educational institutions have declared a holiday in Idukki, Kollam and other districts due to the incessant rains.
Two NDRF teams have been sought from the Centre for north Kerala.
With the water level rising alarmingly in the Idukki reservoir, the Kerala State Electricity Board (KSEB) has opened five shutters of the Cheruthony Dam, which is part of the Idukki Dam project on Friday to release excess inflow of water owing to heavy rainfall in the catchment areas of the reservoir in the past many days.
People living downstream of Periyar and Cheruthoni rivers have been warned that there is a possibility of inundation of banks as torrential rain pounded the state for the second day in a row. A year ago around 1,200 people perished.
Dams and rivers overflowed, parts of highways collapsed, and homes were swept away in severe flooding in more than half of Kerala on Friday in the third day of heavy downpour that has claimed the lives of 30 people and left almost 54,000 homeless.
A National Disaster Response Force (NDRF) team has been sent to Kozhikode as the heavy rainfall caused a flood-like situation in Kozhikode and Wayanad districts.
An army spokesperson said the timely intervention saved many lives and properties in the flood-hit districts.
Chief minister Pinarayi Vijayan has cancelled all official events and is monitoring the floods situation.
Around 70 people are stranded in a resort in Munnar after the roads to the resort were blocked due to a landslide. "Things are well under control". The road to Kakkayam dam site in Kozhikode was cut off after the connecting road was washed away in the floods, reports the Hindu.
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. Landslips occurred at many places in Wayanad and Malappuram also. Now the United States of America government has advised its citizens not to visit Kerala keeping in mind the unsafe situation.
The government has also made arrangements for diversion of air traffic from the Nedumbassery airport in Ernakulam in the event of floodwaters entering the runway.
Talking to reporters here after a review meeting, the chief minister said the flood situation was "very grim" and it was for the first time in the history of the state that 24 dams have been opened at a time following the water level reaching their respective maximum.
Experts said the perigean spring tides from August 11 to 15 could lead to flooding all along the Kerala coast, worsening the situation in low- lying areas such as Kuttanad.