The Epic of Atrahasis is the fullest Mesopotamian account of the Great Flood, but it offers more.

The conditions immediately after the Creation, when the Lower Gods have to work very hard, and complain
Revolt of the Lower Gods
Negotiations
Proposal to create Man, to relieve the Lower Gods from their labor
Creation of Man
Man's noisy behavior; new complaints (this section is now lost)
The supreme god Enlil's decision to extinguish mankind by a Great Flood
Enki's betrayal of the plan to Atrahasis
Construction of the Ark
Boarding of the Ark
Departure
The Great Flood
The gods are hungry (there are no farmers left to bring sacrifices), decide to spare Atrahasis (lost)
Regulations to cut down the noise: childbirth, infant mortality, and celibacy

The text is known from several versions: two were written by Assyrian scribes (one in the Assyrian, one in the Babylonian dialect), a third one (on three tablets) was written during the reign of king Ammi-saduqa of Babylonia (1647-1626 BCE). Parts are quoted in Tablet XI of the Epic of Gilgameš; other influences are in the Babylonian History by Berossus.