If the Ambatale water treatment plant fills with another 3 feet of water, it will have to terminate water supply, the National Water Supply and Drainage Board said.
Ambatale plant supplies water to much of Colombo city and parts of Colombo District and some areas in Gampaha District.
Heavy rains have been falling to the upstream areas of Kelani Basin, threatening to increase the danger of Ambatale becoming nonoperational.
