Mumbai (aka. Mumbai, Greater Bombay, Bumbai) is a city that has grown now to be the city of the extremes. Wherein the richest, the poorest, all in one rainy day were running for shulter. This happened in 2006.
And Kamat has a [picture http://www.kamat.com/picturehouse/elements/monsoon/2682.htm] of this perenial havoc in the city of haves, who become haveless.
You need to experience this rainy havoc. You will find that any rain day effects trains, buses, and air travel.