That's what I've always thought, too. There're mountains and waterfalls. According to one source I looked at briefly, 94% of the population has drinking water, though there are problems with groundwater contamination in some populated areas.
Rainwater harvesting : Resource guaranteed for the underprivileged
Wednesday, March 22, 2017 - 01:00
Today is World Water Day. The Daily News sat down with Executive Director of the Lanka Rain Water Harvesting Forum Dr. Tanuja Ariyananda to discuss what her organization does to combat water scarcity in Sri Lanka. As the world undergoes climate change, seasonal rainfall is becoming more erratic, further challenging scientists and policymakers who wish to ensure water availability for everyone. One such manner of guaranteeing access to water is through rainwater harvesting, whereby rain is captured in large above-ground tanks. Dr. Ariyananda’s organization has set up thousands of these systems to combat drinking water scarcity for people throughout the island. ...