1 : 1 scale modeling

[Sumpter250]

The Woodland Scenics video is a good start, just remember, that video is for an 80' > 90' high "fall", and what you want is about an 8' > 10' "fall".
To put that another way, do the "Scenics' Fall" in Z scale ( +/- )

There isn't the volume of water, the rate of flow, or the "turbulence" in the shorter fall. Most of the rock in the area of the fall, will only be "wet".
That's why I made the comment " That kind of *falling water* has always been a *difficult issue* ", and is also the reason I haven't " got it done ".
I was thinking about using a very light, mono filament fishing line, for the "frame" of the water, and then brushing on the W.S. Water effects. In any case, play with the materials, "off layout", to get the feel of working with them. Considering the size of the falls, I would think using all clear, and then stippling the white "foam" in with a short bristle artist's brush, and white acrylic paint, after the "water" had set up.
Last thought.....try this, and the W.S. method from the video....then choose which works best for you. Have fun