O.K. Here goes:
There once was a righteous man named Utnapishtim.
The (Sumerian Gods) were angry at mankind for their evil ways and sent a worldwide flood as punishment.
One of the gods (‘Ea’) warned Utnapishtim and instructed him to build an enormous boat to save himself, his family, and the seed of all living things.
It rains for many days and caused a world wide flood.
Later the boat lands on a mountain.
Utnapishtim sends out first a dove, then a swallow, and finally a raven, which doesn't come back!
The god Ishtar then places a rainbow in the sky as a promise to mankind that there will be no more floods. (OH, in the version told 3000 years later that man's name would be Noah!)
The way I see it anyway!