Decline of the Sumerian civilization

There is evidence of several major floods that have been proposed to have played a role in the decline of the Sumerian civilization. For example, sedimentary records from the Persian Gulf suggest that there were major floods in the Tigris and Euphrates river systems around 2800 BCE, which may have contributed to the decline of the Sumerian civilization. Other floods have been proposed to have occurred around 2100 BCE and 1700 BCE.