This proposed thread would continue the one started by Moose, but with a slightly different perspective.
I feel the evidence does not support a global flood, but others obviously disagree. This thread is a place for them to present their evidence.
But biblical scholars place the flood at about 4,350 years ago. Not at the K-T boundary, over 60 million years ago, and not at the Cambrian explosion over 500 million years ago. Further, there is no evidence whatsoever of humans being around at those distant dates.
So please limit the evidence presented to support a recent flood to recent time periods. This means you will need to deal with soils, not rocks; with archaeology, not geology; and with radiocarbon dating, not other radiometric dating techniques. It also means that historical evidence will be applicable, such as the records from ancient Egypt.
To get started, archaeologists have been excavating into these recent soil layers for about 150 years. I have excavated probably 100 sites that cross-cut the approximate 4,350 year time period. My colleagues and I have found no evidence for a global flood (massive erosional or depositional features). Rather, we generally find continuity of human cultures, fauna and flora, sedimentation, and most telling of all we find continuity of mtDNA. If there had been a flood at this time, one would expect to find the previous mtDNA haplotypes cut off and to be replaced by haplotypes characteristic of the eastern Mediterranean, representing Noah's female companions.
Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.