Why was a day's rain enough to sink Gurugram?

Rain continued to lash the National Capital and neighbouring areas on Thursday, triggering long traffic snarls, uprooting trees, and causing damage to property in many areas.

The flooding was particularly severe in Gurugram, where roads turned into small rivers and parks resembled swimming pools.

Why is Gurugram becoming a sinking city? VS Kundu, CEO, Gurugram Metropolitan Development Authority, and Dikshu C Kukreja, Urban Planner, discuss.