[Rebelbase]

I’ve swum in the plunge pool of a couple of healthy waterfalls without any issue from water turbulence or air bubble density.

The biggest worry for me was a large stick or log floating over the top and falling.

[norwaypinesavage]

"I’ve swum in the plunge pool of a couple of healthy waterfalls without any issue"

There are a couple of dead swim team members from here that swam near a 4' dam who would disagree with you (if they could).