I agree with you. However there are two different things in play. One is the single miracle the other is a huge string of them that can go anywhere. The first says OK God supplied the water and then took it away. But for that one we still expect signs to be left in the geologic (and perhaps anthropologic) records. Destroyed towns like Pompei. The second is postulating God did it (andf often it seems in a very deceptive way) to make the record look as it does, and it changes as our knowledge of the record changed.
Of course there is the very strong argument that the flood naritive is not meant to be read as litteral anyway. After all it ends with 'And that is why there are rainbows'. Not really typical of stories that are meant to be taken literally. Are we to think the laws of Physics were different before the flood and there were no rainbows?
Read some of AV1611VET's and dad's posts. They argue, respectively, that God took away evidence of the flood ("cleaned up his mess") and that the laws of physics were different so that there were not rainbows.
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