Let me urge you to read carefully Genesis 6-9—chapters dealing with the Flood. If God was really trying to describe a local flood, He surely could have written a little more clearly, for over and over again the wording demands a global flood..... In fact, I have counted more than 100 times when the wording implies a global flood.... It is true that some of the individual words could be understood in a local sense, but ‘in the context’, no other position than that of a global flood is defensible.
Consider these few quotes of the many: ‘the face of the earth (i.e. planet)’ (6:1); ‘end of all flesh… the earth is filled with violence … I will destroy them with the earth’ (6:13); ‘destroy all flesh wherein is the breath of life, from under heaven, and everything that is in the earth shall die’ (6:17). If God had intended to describe a global world-destroying flood, He couldn’t have said it any more clearly.