In other words, Noah isn't mentioned because the story of this possible disaster has nothing to do with water.
Gilgamesh:
I looked for land in vain, but fourteen leagues distant there appeared a mountain, and there the boat grounded; on the mountain of Nisir the boat held fast, she held fast and did not budge. One day she held, and a second day on the mountain of Nisir she held fast and did not budge. A third day and a fourth day she held fast on the mountain and did not budge; a fifth day and a sixth day she held fast on the mountain. When the seventh day dawned I loosed a dove and let her go. She flew away, but finding no resting place she returned. Then I loosed a swallow, and she flew away but finding no resting place she returned. I loosed a raven, she saw that the waters retreated, she ate, she flew around, she cawed, but she did not come back. Then I threw everything open to the four winds, I made a sacrifice and poured a libation on the mountain top.The story refers back to the flooding of the Black Sea around some 7,000 BC. The Hebrews borrowed the story from the Sumerians.
for more on this read The Flood is Found!