The relevance of the question about water in the Grand Canyon is that it was an enormous body of water moving through there at one time. I'm curious as to how geology accounts for this fact. That's why I was thinking about it and posted it.
Why do you think that it was an enormous body of water moving through there at one time? That just isn't what it looks like when you look at the erosion formation. It looks like the Colorado River working over millions of years.