I would guess that Flood geologists would have serious problems trying to respond to this thread, which involves an interesting take on matters - what observed, scientific occurances would a global Flood have predicted? - Like Evolution Theory, or General Relativity, which predicts certain outcomes which should be observable and confirmed by such observation.
So far, only TD has offered an extensive answer, and as his comment suggests, the global Flood would predict occurances that scientists have not observed.
I can't come up with anything either (I'm not a Flood geologist or apologist). To me, it seems that the Flood would predict outcomes that we have not observed, such as the extremely rapid evolution and speciation that TD mentioned.