Ryan & Pittman , 7,600 years ago.
"For thousands of years, the legend of a great flood has endured in the biblical story of Noah and in such Middle Eastern myths as the epic of Gilgamesh. Few believed that such a catastrophic deluge had actually occurred. But now two distinguished geophysicists have discovered an event that changed history, a sensational flood 7,600 years ago in what is today the Black Sea."
7,600 years ago would be about the time of the eruption of Mt. Mazama in our Northwest which left the 6 mile diameter Crater Lake. This could have seeded the air to cause many days of heavy rain and serious flooding. Other dates to look at for serious flooding are the eruption of Thera about 1626 BC, and earlier large eruption of Thera that I don’t have a date for, and the major eruption of Mt. Etna at 1500 BC plus or minus 50 years.
Recently a 2 mile diameter crater has been found in the Iraq Marshes which were drained by Saddam Hussein to destroy the Marsh Arab people. It is dated about 2,000 BC. There are apparently two periods of major disruption dated about 150 years apart. One was localized to the Mediterranian area, the other was world wide. Someone mention 2350 BC, perhaps that was the world wide event. Historically, the 2,000 BC period is recorded in the Ipuwer Papyrus, now in the Lyden Museum which describes the disturbances of what is known in Egypt as the First Intermediate Period.