The evidence exists for the FLOOD; however, if that evidence calls into question presently accepted theories, such "anomalies" are shelved and ignored until "such time" the "science" may explain them away in light of presently held theories... Example:
The Song of Gilgamesh has a huge flood in it, ancient Sommer and predates the Bible by over three millennia.
The Euphrates River Basin did flood from time to time caused by spring snowmelt from the Zagros Mountains and spring rains. That's what built the Delta south of Basra.
There is NO worldwide flood footprint.
LittleNipper
What about the Tigris River?
All the Sumerian myths are about the Euphrates River. The two rivers are pretty far apart.
Tigris-Euphrates river system | river system, Asia ...
Tigris-Euphrates river system, great river system of southwestern Asia. It comprises the Tigris and Euphrates rivers, which follow roughly parallel courses through the heart of the Middle East. The lower portion of the region that they define, known as Mesopotamia (Greek: “Land Between the
www.britannica.com
Having risen in close proximity, the Tigris and Euphrates diverge sharply in their upper courses, to a maximum distance of some 250 miles (400 km) apart near the Turkish-Syrian border. Their middle