As severe flooding forces millions of people from their homes in northern India, residents in the south of the country are facing a different kind of water crisis: drought. On July 12, a train carrying 2.5 million liters of water arrived in the city of Chennai. That load will provide relief to residents who have struggled with shortages for the past month, but a “Day Zero”–when piped water sources are expected to run dry–is on the horizon for 20 other cities across the country. In the 2018 monsoon, Chennai, home to more than 8 million people, saw 55% less rainfall than average–the worst drought in 70 years.