Spread of the East Kolkata Wetlands site. World-renowned as a model of a multiple use wetland, the site’s resource recovery systems have been developed by local people through the ages. The wetland not only treats the city’s sewage but the treated water is utilised for pisciculture and agriculture, thus saving the city of Kolkata from the costs of constructing and maintaining waste water treatment plants.
1,000 million litres
of sewage which enters the East Kolkata Wetlands (EKW) each day. In 2016, the cost of setting up a Sewage Treatment Plant to handle similar quantities of sewage in Malad, Mumbai was estimated to be Rs. 4,500 crore.
fish ponds - or bheris as they are known locally - feed off the incoming sewage water that undergoes a process called bioremediation. Organic matter from the sewage along with sunlight cause the growth of planktons, which in turn is used to feed the fish and in the process the water is purified. Purified water is then utilised to grow vegetables in adjoining fields. (Click Engage and Interact to watch video).
of fish produced in the bheris each year - that meets close to 33% of the city's needs.
of fresh vegetables produced each year - approximately 40% - 50% of the city's requirement.
Number of people who's livelihoods depend directly on the wetland and a further 50,000 indirectly supported.
East Kolkata Wetland declared as a Ramsar site.
estimated annual economic value of the wetland.