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DocSavage Actually, the "Great Flood" legend has a basis in fact, with a layer of flood debris in the soil around the whole Eastern Mediterranean Regeon going back over 3000 years and coinciding with the volcanic eruption that took out the Minoan Empire close to Crete. (This is also one possible source of the Atlantis Myth)
This one event would have been catastrophic for all populations living on the shoreline or close to rivers and would grow in the telling. There may even have been a "Noah" far out on a family fishing boat who rode the Tsunami out at sea and returned to find his home port destroyed. (Shades of Forrest Gump and the Shrimp Boat..)