[DManA]

What self serving nonsense. A flood that supposedly explains hundreds of feet of rock and only one measly canyon on the entire continent? They should dominate the landscape everywhere.

[fishtank]

The Grand Canyon flood took place quite a bit AFTER Naoh’s flood.

It was the result of the breaching of an Ice Age lake ...

.... best I can tell you is for you to dig more deeply on ICR’s site.

[SampleMan]

Ice dam collapse at the end of the ice age, releasing an enormous fresh water inland sea (perhaps multiple times over several ice ages).

Water would go downhill, not all of the continent, just the most direct downill path to the ocean.