And that's why the bible says that the flood which drowned most of Noah's family (Gen 5:26-32) had no effect on a nearby olive tree growing outside the flooded area from which a leaf was plucked by Noah's pet bird. And why two of Noah's brothers and their families weren't drowned (Gen 4:20-21) since they were presumably living outside the flooded area.With a water depth of only 24 feet, there's no need to build an ark. People can simply build a house 30 feet high. A lot of trees are 100ft high. Mountains and hills are even higher than that. So many places to seek refuge.