Why Indian cities flood during monsoon rains

Mumbai is unique among coastal cities. It’s not only surrounded by the Arabian Sea it also has four rivers — Mithi, Dahisar, Oshiwara and Poisar — passing through it. There are also four creeks — Malad, Mahim, Mahul and Thane.

All these waterways make the city of 21 million especially prone to floods during monsoon season.