Touche! And where does the scripture indicate to you that the wiping out did not occur over a period of perhaps decades, with a concentrated flooding of the Middle East via the waters breaking through from the Atlantic Ocean to inundate the entire area (and evidenced with submerged ruins along the Black Sea, for instance)?
Come on, I know you must have a Bible. Genesis 7 sets up the timeline very specifically.
2nd month, 17th day: Flood begins.
40 days, 40 nights rain.
150 days duration the earth is covered completely.
150 days duration the waters receded.
7th month, 17th day: landfall on the mountains of Ararat.
10th month, 1st day: mountaintops all visible.
40 days: release of various birds, 2nd dove returns with an olive leaf, 3rd dove does not return.
1st month, 1st day: The water is dried up from the earth. The catastrophe is officially over, God swears not to wipe out the population again by flood.