The government said 72,119 people were housed in 432 relief camps, but thousands of passengers were still stranded at the Chennai airport and railway stations.
Electricity supply snapped in many areas. Telephone services too were hit.
With schools and colleges shut, and vast areas under water, most buses went off the roads and suburban train services were suspended.The Indian Coast Guard has shifted over 150 marooned people in Chennai, and over 1,000 people stranded at different locations were provided with food cooked on board Coast Guard ships.
Unlike in the past, upmarket localities like Shastri Nagar, Anna Nagar, Alwarpet and Mylapore were also flooded. With the river overflowing, traffic over the Adayar bridge near Saidapet was closed for safety.