God promised us that He will never destroy the world again with water.

He promised by reminding us with a rainbow in the sky.

Genesis 9:14-15 (KJV) – and it shall come to pass, when I bring a cloud over the earth that the bow shall be seen in the cloud: and I will remember my covenant, which is between me and you and every living creature of all flesh; and the waters shall no more become a flood to destroy all flesh.