IAF officials said the evacuation was done from Ashok Nagar and another adjoining area of the city.
They also airdropped 100 litres of water and 150 food packets.
"12 infants and 10 adults, including six women were today airlifted. The helicopter took off from the Tambaram base. Other helicopters have also been put on standby," the officials said.
They added that all the evacuees were winched up during multiple sorties.
At least 71 people have died due to the rains in Tamil Nadu.
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