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The flood story was included because in it, the flood hero Utnapishtim is granted immortality by the gods and that fits the immortality theme of the epic. The main point seems to be that Utnapishtim was granted eternal life in unique, never-to-be-repeated circumstances.
Gilgamesh is known to be the first great hero, and the epic is known as the 'first great masterpiece of world literature'. Gilgamesh has encounters with creatures, kings and gods and also provides a story of human relationships, feelings, loneliness, friendship, loss, love, revenge and the fear of death.
