India’s cities aren’t just fighting the rain. They’re fighting their own infrastructure
The Centre for Science and Environment has previously documented how Chennai's natural drainage network was damaged by encroachment and construction. Its analysis noted that Pallikaranai, once around 5,000 hectares, had shrunk to roughly 600 hectares around 2010-11. The consequences are predictable. When wetlands, lakes and channels disappear, the water does not disappear with them. It simply has fewer places to go. A 2026 study on Pallikaranai similarly found that rapid urbanisation, expansion of impervious surfaces and wetland encroachment have altered the marsh's hydrological functions and increased flood risks.
