Tamil Nadu's worst drought in 140 years has dried up reservoirs in the region, severely impacting the availability of drinking water in Chennai and other cities. Water supply across Chennai has dropped by half, with the government saying tap water may dwindle to a trickle in the days to come. In many areas, piped water is being supplied only once every three to four days. "We are supplying between 450 to 470 million litres of water every day compared to the normal requirement of 830 million litres," said Arun Roy of the Chennai Metropolitan Water Supply and Sewage Board that supplies water across the city.