After IIT-B suggestion comes debate: who diverts Mithi, who pays?

IIT Bombay's suggestion to divert the course of Mithi river alongside the internal boundary of the airport - which is the most viable option to prevent flooding of the river has already mired in controversy with both the Mumbai International Airport Limited (MIAL) and the Brihanmumbai Municipal Corporation (BMC) locking horns over the responsibility of carrying out the work and bearing its expense