Heavy rains lashed Chennai and its suburban areas overnight and on Sunday morning leading to water logging.
Authorities on Sunday sounded a preliminary flood alert as two city reservoirs are set to be opened.
Chembarambakkam and Puzhal reservoirs, that serve as important sources of drinking water to the Chennai city would be opened to let out surplus rain water, authorities have announced.
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District collectors of Kancheepuram and Tiruvallur have been advised to evacuate people living in low-lying areas and house them in safe locations.
The Indian Meteorological Department has meanwhile predicted heavy showers and thunderstorms for Tamil Nadu, Kerala and Andhra Pradesh over the next few days.