The Flood

Both of the stories of "Genesis" and "Gilgamesh" have mentioned the legend of the flood, and both contributes a lot to describe the scene vividly. The flood in both stories are talking about how the Gods intend to destroy human and how the heroes survive with a boat at the end.
According to the data, "Gilgamesh" is the first great heroic narrative of world literature, which has existed in 2700 B.C. Compare with that, the "Pentateuch"(first five books of the Bible) does not appear until 539 B.C. Therefore, the flood stories in "Genesis" and "The Epic of Gilgamesh" are very similar but still have some bifurcations due to the development of the civilization.
The difference between "Genesis" and "Gilgamesh" can be concluded as the following points. First, there exists a very different attitude about the God. It is obviously to see that the sole god in "Genesis" has absolutely centred power. Compare with that, "Gilgamesh" has variety gods in diverse positions with very similar power. Second, the reason why God inflicts the flood are quite different. Anu and other gods intend to destroy human just simply because of the overpopulation while the God in "Genesis" inflicts the flood due to his dissatisfaction with the sinner. Third, the selected heroes are different. Utanapishtim is a random selected human but Noah is selected because his faith.