Well, no, really, the flood myth is only found in a few Mediterranean and Mesopotamian cultures which had significant contact with one another, and there isn't a shred of geological evidence to support the occurrence of a worldwide--or even region-wide--flood. Flood mythology derives primarily from the Mesopotamian reliance on the Tigris and Euphrates flood-plains for sustenance. The "conquest" of the "waters" is a metaphor for the emergence of agriculture, nothing more.