Quite often at my workshops I get the question: how do you get silky smooth water? The answer is to use a slow shutter speed of below a 1/60 of a second. You will have to steady the camera on a tripod or rest it on a rail and you get a shots like these.
This was taken at a shutter speed of 1.6 seconds so plenty of time to blur the movement of the water of Buderim falls.
This image of The Chasm in New Zealand was taken resting the camera on the bridges rail.