Let me ask those who wish to explain the Grand Canyon by the collapse of
glacial lakes, how many lakes must have collapsed in order to carve it.
.... <<
Not being a geologist, I could not take you on even if I wanted to. But
I'm not inclined to on this one. (Ah shucks!) My gut-level feeling is
that glacial-lake collapse did not do the job.
However, let me relate an anecdote: Back in 1964 (I think the year is
right), my wife and I had to change our vacation plans when Glacier
National Park was closed for the summer -- due to massive flooding. Yes,
flooding. Heavy snows, recently melted, were followed in the spring by
very heavy rains on water-soaked slopes, and big-time flooding with fast
moving water occurred.
Twenty miles of interstate highway was devastated. We saw some of it.
Huge sections of the interstate were totally gone -- sculpted out and no
where to be seen. In their places were large holes. Massive damage, but
nothing on the order of the Grand Canyon.
All of this occurred at elevations in excess of a mile. I was shocked by
what water could do in a very short period of time.
Gordie