[Ray76]

The article discussed “building an angled flip just above the collapse site”, not at the end of the spillway.

[Ray76]

Gray rock on upper right. This was not subjected to hammering yet it eroded quickly.

on the ground in that area

[EarthResearcher333]

I'm confused: Your post on the canyon erosion (re: amphibolite erosion thesis) was in response to my original post (2,632) from myself to abb discussing a "flip" dispersal system at the plunge pool ("The end of the broken spillway.."). This discussion was specific to the article abb posted to me. btw- I clearly understood the "flip" design proposal. The article clearly states that the proposal is to make "water jump the gap" i.e. Jump over what is called the plunge pool.

Then I responded to your amphibolite post & pic to me with post 2,636 demonstrating a simple proof of structural & functional soundness when concrete, properly emplaced in amphibolite with a "flip" dispersal system at the end of the original spillway.

Was there a misread of my original post (2,362) in discussing the challenges of anchoring a "flip" design at the end of the damaged spillway?