Major cities of India are becoming more vulnerable to flood conditions. Discuss.

From Mumbai (2005) and Chennai (2015) to Hyderabad (2020), Bengaluru (2022) and Delhi (2023), major Indian cities now flood with disturbing regularity, an outcome of how they have grown as much as of how it rains.

Why vulnerability is rising

• Loss of natural sponges: lakes, tanks and wetlands have been built over; Bengaluru has lost most of its interconnected lake system, and Chennai's Pallikaranai marsh has shrunk to a fraction of its former extent, removing natural retention basins.
• Concretisation: paved, impervious surfaces prevent infiltration and convert rainfall almost wholly into runoff that overwhelms drains.
• Obsolete drainage: storm drains designed decades ago for far lower rainfall intensities, further choked by solid waste and encroachments.
• Floodplain encroachment: construction on riverbeds and drainage channels, from the Mithi in Mumbai to the Yamuna floodplain in Delhi, blocks natural outflow.
• Climate change: short-duration, high-intensity rainfall events are increasing, compressing weeks of rain into hours, as the Mumbai deluge of 944 mm in a day showed.
• Governance gaps: fragmented agencies, poor pre-monsoon desilting and disregard of drainage in building approvals.

Way forward

• Implement the NDMA Urban Flooding Guidelines (2010): city-specific drainage master plans and rainfall-threshold early warning.
• Restore and legally protect urban wetlands and lake chains; mandate rainwater harvesting and permeable surfaces on the sponge-city principle.
• Enforce floodplain zoning and deploy real-time flood modelling, as Chennai's CFLOWS integrated flood warning system does.

Urban flooding is largely a self-inflicted hazard; recovering the city's natural hydrology matters as much as engineering its drains.