Tilik and Tarai, who lived near a sacred spring where they were making the land, discovered that their mother had been urinating in their food. They exchanged the food and ate hers. In anger, she rolled away the stone which had confined the sea, and the sea poured out in a great flood. [Roheim, in Dundes]
or
References: Dundes, Alan (ed.) The Flood Myth, University of California Press, Berkeley and London, 1988.