Hmmm! Now let me get this straight you are saying there should be several accounts of this flood? But didn't everyone die in the flood but Noah and his family? Why would one of them write another account of it and not have their father as the central character?

The Epic of Gilgamesh is, perhaps, the oldest written story on Earth. It comes to us from Ancient Sumeria, and was originally written on 12 clay tablets in cunieform script. It is about the adventures of the historical King of Uruk (somewhere between 2750 and 2500 BCE).

In both the Genesis and Galgamesh stories:
The Genesis story describes how mankind had become obnoxious to God; they were hopelessly sinful and wicked. In the Babylonian story, they were too numerous and noisy. The Gods (or God) decided to send a worldwide flood. This would drown men, women, children, babies and infants, as well as eliminate all of the land animals and birds.
The Gods (or God) knew of one righteous man, Ut-Napishtim or Noah.
The Gods (or God) ordered the hero to build a multi-story wooden ark (called a chest or box in the original Hebrew).
The ark would be sealed with pitch.
The ark would have with many internal compartments
It would have a single door
It would have at least one window. The ark was built and loaded with the hero, a few other humans, and samples from all species of other land animals.
A great rain covered the land with water.
The mountains were initially covered with water.
The ark landed on a mountain in the Middle East.
The hero sent out birds at regular intervals to find if any dry land was in the vicinity.
The first two birds returned to the ark. The third bird apparently found dry land because it did not return.
The hero and his family left the ark, ritually killed an animal, offered it as a sacrifice.
God (or the Gods in the Epic of Gilgamesh) smelled the roasted meat of the sacrifice.
The hero was blessed.
The Babylonian gods seemed genuinely sorry for the genocide that they had created. The God of Noah appears to have regretted his actions as well, because he promised never to do it again.

The were a number of differences between the two stories:
Noah received his instructions directly from Jehovah; Ut-Napishtim received them indirectly during a dream.
Noah's ark was 3 stories high and rectangular in shape. Two estimated dimensions are 547 x 91 ft. and 450 x 75 ft. The Babylonian ark was 6 stories high and square.
Ut-Napishtim invited additional people on board: a pilot and some skilled workmen.
Noah's ark landed on Mt. Ararat; Ut-Napishtim'sat on Mt. Nisir; these locations are both in the Middle East, and are located few hundred miles apart
In the Bible, some of the water emerged from beneath the earth. And the rains from above lasted for 40 days and nights. A 40 day interval often symbolized a period of judgment in the Hebrew Scriptures. 2 In the Babylonian account, the water came only in the form of rain, and lasted only 6 days. Noah released a raven once and a dove twice; Ut-Napishtim released three birds: a dove, swallow and raven.

Sounds like the story of Noah was copied from the epic of giglamish.