Quote Originally Posted by copake_ham View Post
the water flows over the rocks in a soft silk-like fashion.

How is this done? Is it by exposure settings? Or is it done in during processing?
That's the "bridal veil" look, no photoshop required. You will need a tripod. You do want a bit of sunlight as a highlight on the flow you wish to feature. Slow exposure, just enough to subordinate the detail of the flow. Moderate DOF, keep some of the still stuff in clear focus. Try exposures from maybe 1/8 or so to a couple seconds.