How to combat floods in cities, or stop them from sinking by replenishing aquifers eroded in urbanisation? What are the latest trends in distribution and management of drinking water? How to prevent water borne ailments or harvest rainwater? The 3rd World Water Forum, to be held in Japan between March 16 and 23, will encourage sharing of best practices in water, and a Calcutta based NGO will be part of the global search for "sustainable solutions". Centre For Built Environment, a city based "voluntary think-tank" of like minded architects, urban planners and environmentalists has been invited by the World Water Council, organiser of the summit, to convene a session at the Osaka International Convention Centre.