The recurring flooding in Delhi and Mumbai is not just an inconvenience; it poses a significant threat to public safety, health, and economic stability. Waterborne diseases can spread rapidly in stagnant water, and the damage to property and infrastructure can run into billions of rupees. For residents, it means lost workdays, damaged belongings, and immense stress. For businesses, it translates to supply chain disruptions and financial losses. The situation underscores the urgent need for robust, sustainable solutions that go beyond temporary fixes. The long-term implications of climate change, with more erratic and intense rainfall patterns, mean that these urban centers will face even greater challenges in the future if proactive measures are not taken. The current approach of relying solely on grey infrastructure (traditional concrete drains) is proving insufficient.