The following reference by a Rabbi gives a detailed description of the origin of the Glood story of Genesis.
In the Gilgamesh epic, Utanapishti tells Gilgamesh the story of the great flood and how he survived it. Scholars have often held that this story lies behind the biblical account of Noah and the flood. However, a good case can be made that an even more ancient tale, the Atrahasis epic, on which the flood story in Gilgamesh draws, is the source of the biblical flood story.
The Mesopotamian Origin of the Biblical Flood Story - TheTorah.com
In the Gilgamesh epic, Utanapishti tells Gilgamesh the story of the great flood and how he survived it. Scholars have often held that this story lies behind the biblical account of Noah and the flood. However, a good case can be made that an even more ancient tale, the Atrahasis epic, on which...
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The Mesopotamian Origin of the Biblical Flood Story
In the Gilgamesh epic, Utanapishti tells Gilgamesh the story of the great flood and how he survived it. Scholars have often held that this story lies behind the biblical account of Noah and the flood. However, a good case can be made that an even more ancient tale, the Atrahasis epic, on which the flood story in Gilgamesh draws, is the source of the biblical flood story.