I must say, I love this shot! I learned how to do this last year, and this was the first time I got to use it on a waterfall.
Taken with my Canon EOS Elan IIe, using Kodak Gold 400 speed film, and on "Shutter Speed Priority" mode. It was a 1/6 to 1/8 of a second exposure -I had the camera balanced on the guardrail and I used the timer to take the shot so there'd be no camera shake. It was an overcast evening, just an hour or so before sunset.