Actually, the Sumerian king list was carved on a clay prism, and breaks the kings into two groups, “Before the Flood” and “After the Flood”.
It sets out dynasties in order, but various inscriptions and chronicles show that these were not serial but parallel dynasties, ruling the various city-states, rather than a series of one supreme ruler.
“The Flood” isn’t (as Woolley claimed from his excavation evidence) a reference to a worldwide flood. The thick strata of sand that caps off one earlier level of occupation with the subsequent one was an alluvial fan, and not found in other sites from the same time.
https://www.ashmolean.org/sumerian-king-list
There’s also this legend:
https://www.britannica.com/topic/Utnapishtim
My understanding is that the flood was also recorded by the Babylonians and the Assyrians. but their versions were not as detailed as the account in the bible. Therefor its thought that the bible held the older account