Thanks for pointing towards the Eridu Genesis and the Epic of Gilgamesh as sources for the story of the Biblical Flood.
There is no doubt in my mind of a connection between these three accounts. In reading the Epic of Gilgamesh I was astonished to find so many parallels between it and different Biblical accounts from Creation to Christ. As well, the Odyssey was probably also based on the Epic.
The Flood, as told in the Epic, is part of an allegorical tale attributed to Gilgamesh. This flood is symbolic. That is not to say that a great flood, or floods, have not ravaged the Near East or other parts of the Earth in distant times.
The Epic is about a quest for eternal life and an understanding of the human condition. The Bible contains a similar motif.
If the Epic Flood is symbolic then, by my reasoning, so is the Biblical Flood.
The interesting question is, "What is the source of the Epic?"
The city of Gilgamesh was founded by the "seven wise ones." These Seven Sages appear in other accounts of distant times. Who were they? Why are they "wise"? What is "wise"?
How far back does this story of gods and men go?