The event was organised by Nihara Resort and Spa at Kothad Island in association with Scuba Cochin, Kalypso Adventures, Ben's Cruises and Secret Routes.
During the conference, French wastewater and management company Veolia pledged to spend USD 7 billion over the next five years on infrastructure, technology and research.
A Kannur-based collective and wildlife rescuers pitched a tent on top of the hill to make a watering hole.
According to UNICEF, four billion people - almost two-thirds of the world's population - experience severe water scarcity for at least one month each year.
The 127-year-old existing structure, a masonry gravity dam on the River Periyar, is located at Kumily Panchayat within Peermade taluk of Idukki district.
A total of 5,000 water kiosks would come up soon.
Murugan of Charuvuvila House at Venganoor got trapped in the waters while he was cleaning up the irrigation canal which was filled with garbage.
The valve has been closed partially to control the flash flood-like situation on the road.
Last month while defending the hike in water charges he said most families would be requiring only about 15,000 litres monthly.
Over 30 wards in Kochi Corporation was affected with the major pipe carrying water from Aluva to the city breaking on Tuesday.