Waterfall

To achieve these milky waterfall effects, I think you have to use grey filters. On such a sunny day, doesn't matter how you force your system to go for a long exposure time, it will still be too short. Withut filter you also loose the possibility to play with the Dof. So recommendation would be, to use standard settings on your camera but an ND2 to ND3 grey filter. Your exposure time increases by the factor 100 (ND2) or 1000 (ND3). And you then need a really good tripod and ideale a remote control (or at least using the 2 sec. timer. In addition, I would recommend some post processing where you can also blur the milky parts a bit more and increase the sharpness of the non-blured parts.