The first two I like.
The flowing-water-effect in the second gives it quite a bit of dynamics, it feels like it is moving (to me).
The water is too blown in the third, I think you can only pull of those long-shutter pics in daylight with a filter (little do I know, though, since I have no ND filters).
Set your CAM to "M" Shutter speed was 1" and f25 make sure to use a Tripod. and let mother nature do the rest .. remember to adjust ur "f" depending on how much light you working with.. the bigger the "f" number the the less light its going in.. so for a day shot.. bigger number is better..