Getting moving water to blur is easy: just select a long shutter speed. Doing so without a tripod requires image stabilisation, which is what’s helped here.
Hardware: Olympus EP-1, Zuiko 40-150mm f/4-5.6
Exposure: ISO100, 1/3s @ f/14, shadow white balance
Post: Cropped, Reduced exposure, Increased contrast, black point, desaturated slightly, sharpened.