Not only is there no evidence of a global flood, but there is missing evidence that should be apparent today. Not only would a global flood have destroyed world ecology but it would have made the world uninhabitable for hundreds of years, if not permanently through changes in the wobble and rotation of the Earth. Things like poisoning the soil, ripping off the top layer, destroying the oceanic ecosystem by scattering plankton outside the currents, poisoning freshwater bodies with saltwater and throwing off the PH, killing any coral beds and all deep ocean life through excess PSI, cold and lightlessness.
If the flood were an actual physical event it would have done a lot more than anything any evidence indicates.