How does the Noah's Ark narrative relate to the Gilgamesh flood account?

According to evidence presented by P.J. Wiseman concerning the toledoth, the Genesis account was written by eyewitnesses to the events and therefor is the primary and older source.

The word translated 'generations' in the repeated formula "these are the generations of" should be considered the signature line on a clay tablet, and Genesis read as a string of clay tablets transcribed on to papyrus with their respective colophons intact.

The tablets would have been passed Father to son until they were carried into Egypt with Jacob and likely put into the Pharaoh's library by Joseph where Moses would have had access to them.

The archeology was rather late (1940's) and so modern source theories were already fairly well established. Wiseman's evidence has been considered favorably by Harrison.