I took this shot yesterday at the New Croton Dam, which is one of the locations on my Croton Creative Workshop.
I used a Tiffen 2-8 stop ND filter to get a low shutter speed for the "soft and flowing" water effect.
Below is an uncropped shot w/out the filter.
Here's a movie on the use of the filter - another Rick's Quick Tip.
Other gear used for the photograph:
Canon 5D Mark III, Canon 24-105mm IS lens and Induro AT114 Tripod.
Explore the light,
Rick