The heavy rainfall in Bengaluru, which led to the death of a young Infosys employee in a flooded underpass, has revived the discussion around the role of water bodies in preventing such floods. Unfortunately, with rapid concretisation, water bodies are vanishing across cities.

July saw devastating floods in Delhi as the Yamuna waters reached the Red Fort for the first time in 45 years. Many neighbourhoods in the Capital went under. Those displaced had to be shifted to temporary shelters. Which are the biggest lessons from this deluge for India's metropolises?