The third aliyah describes the mabul (flood).
It rained for 40 days and 40 nights and then the waters increased beyond the depth caused by the rain. The waters rose to a height of 22-1/2 feet above the highest mountains. The water covered the earth for 150 days. The mabul killed all animals, creeping things and fowl (but not fish).
Everything on earth died except Noach and those that were in the tevah with him, floating on top of the water. Eventually the waters receded and the tevah came to rest on mount Ararat.