The evidence points to the Babylonian narrative being a derivative not only of Genesis but of the Flood event itself. Rather fascinating, particularly in the light of the Gilgamesh hero seeking out Noah's family!
Except that there are no Hebrew version of Gilgamesh in which the hero seek out Noah, eg in Genesis.
Two, the Babylonian narrative wasn't derivative of Genesis, but the other way around. Genesis only appeared in the 1st millennium Iron Age, perhaps as early as the 9th century BCE (J-source), but certainly from 7th century BCE onward (E-source early 7th century BCE; D-source late 7th century BCE; P-source 6th century and 5th century BCE).
Where as (A) the Sumerian Ziusudra have been around the 2nd half of 3rd millennium BCE, (B) Old Babylonian Atrahasis has been around since 19th or 18th century BCE, (C) mid-2nd millennium BCE (to 1st century BCE) Middle Babylonian Utnapishtim.
Tablets of Gilgamesh have been found in Sumerian poems, and Old Babylonian tablets, all the way to time of Neo-Assyrian and Neo-Babylonian periods. There have never been complete Bronze Age tablets discovered, but when you compared the Standard Version from Neo-Assyrian tablets from the Library of Nineveh to all the fragments of the 2nd millennium Bronze Age tablets, you would see that they are almost word-for-word the same, indicated that Old Babylonian epic of Gilgamesh most likely have the almost identical contents and styles as that of later Standard Version, whether the Flood hero be named Atrahasis or Utanapishtim.
It is during the Middle Babylonian period that story of Gilgamesh and the Flood had spread outside of Mesopotamia, and clay tablets (fragments) were found in Egypt (city of Amarna that was built by Amenhotep IV, better known as Atkenaten, 1353 - 1336 BCE), Hattusa (Old Hittite Kingdom), in the city of Ugarit (Ras Shamra) and in the Canaanite city of Megiddo, all dated to between 16th and 14th centuries BCE, long before the historical existence of Israel.
The only historical evidence to Bronze Age Israel is from the Egyptian inscriptions on the Merneptah (1213 - 1203 BCE), son of Ramesses II, from the New Kingdom 19th dynasty.
There are no evidences to support monotheism in Bronze Age Canaan. The Hebrew god by the name of El, only exist in 8th or 7th century BCE, but it originated from Bronze Age Canaan, Syria and Ugarit, during the 2nd millennium BCE.
You really don't know what you are talking about, when you say the Babylonian epics were derivative of Genesis. Genesis didn't exist when Ziusudra first appeared. There are no evidences to support any Bronze Age Hebrew Noah, as written tradition or as oral tradition.