Nature Photography: How to Shoot Waterfalls

Lighting: Like shooting trees in autumn, the best lighting is overcast, especially in between rain storms. In the Upper Peninsula, it rains almost every day in the fall. You want that dark diffused lighting in order to slow down your shutter speed. 
Shutter Speed: In order to get that blurred-smooth-flow look to your waterfall scene, you need to shoot at a shutter speed of 1 to 1.6 seconds.  
Tripod and Remote Shutter Release: At shutter speeds of 1 to 1.6 seconds, use of a tripod, a good tripod is a must. 

Your Camera's Self-Timer: Using your cameras self-timer feature will accomplish the same effect as using a remote shutter release. When this feature is set, you press the shutter, and the camera doesn’t expose your film or image sensor for a pre-set number of seconds. Setting your self timer to 5 seconds will allow for any vibrations to cease when pressing the shutter button.