The issue is even if such evidence could be found that would not support the accounts in the stories.
Maybe not but I have always thought that a story grows in the telling. It would be neat to see if a regional flood for the appropriate time could be confirmed though. Something like the black sea deluge.
'Qui non intelligit, aut taceat, aut discat' The mind is like a parachute. It only works when it is open.-FZ The industrial revolution, flipped a bitch on evolution.-NOFX Opening your mind to imagination shouldn't close it to reality. It takes all kinds to make a mess- Benjamin Hoff
Well, the area is one that has seen many floods, particularly if you look at the Tigris Euphrates area and since there is no sure date for the stories it is almost certain that you can find many flood events that could be the origin of the myths.
Anyone so limited that they can only spell a word one way is severely handicapped!