It is an extraordinary project that involves building a 64 km dam and turning a part of the Arabian Sea into a freshwater lake. It will take at least 20 years to build and if it ever gets off the ground, it will cost around Rs 50,000 crore (Rs 500 billion). It envisages creation of fresh water basin of more than 2000 sq. kms, which will receive water from 12 rivers flowing into Gulf including excess water from Narmada, Mahi, Sabarmati and Dhadhar. Labs NEERI and NIO signed MOU to carry out impact assessment study.