First reference:
There is archaeological and geological (geomorphology) of the Tigris Euphrates valley that supports this. I have seen this before, and I consider it worth citing.
Source:
Tigris and Euphrates Floods
A prolonged series of excavations was conducted at Ur under the leadership of Sir Charles Leonard Woolley from 1922 to 1934. Woolley found evidence of a settlement at Ur during the `Obeid Period (before 3500 B.C.). Flint objects, clay figurines, and pottery of the `Obeid type were made by the pre-Sumerian settlers at Ur. Above this `Obeid level, Woolley found a layer of silt from three to eleven feet thick which he thought to be the remains of the biblical flood. This seemed to support the claim of a catastrophic flood in the area around 2800 BCE. The event was clearly a local, not a global, event, however) and pre-dates the Biblical book of Genesis in the tale of the good Ziusudra who builds a great boat by the will of the gods and gathers inside two of every animal.
According to tradition Kish was the first city founded after the Biblical flood. Captain Ernest Mackay and Stephen Langdon, excavating at Kish, also came upon flood deposits, but pottery evidence indicates that the two floods did not take place at the same time or even in the same century. Watelin found evidence of two floods, one dated in 1923 as occurring about 3400 BC and the other some six hundred years earlier. He further suggested that the later flood may have been the flood mentioned in the Bible. The Dynasty of Kish, the second of the Babylonian dynasties of the Sumerian rulers, was once dated as early as c.4401-3815, but is now dated at 2844 BC.
The Tigris and Euphrates rivers changed their beds several times, and the so-called flood silt may have been formed when the rivers inundated parts of the land that had earlier been inhabited. Martin Beek suggests that the so-called flood silt was not caused by water at all. In his opinion it was produced by the dust storms which occur in southern Mesopotamia each spring and summer.
The flood layer in Ur discovered by Leonard Woolley occurred about the same time as a flood in Nineveh, but is dated in the late Ubaid period [generally held to have ended around 3800 BC]. This Ubaid period flood was too early to be the flood of Ziusudra which was dated by archaeologist Max Mallowan at the end of the Jemdet Nasr period and the beginning of the Early Dynastic I period. This flood was radiocarbon dated at about 2900 BC flood and corresponds to flood layers attested at the Sumerian cities Shuruppak, Uruk, and the oldest of several flood layers at Kish. This flood of 2900 BC left a few feet of yellow mud in Shuruppak. The Kish Flood of 2600 BC was too recent to be the Deluge.
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