On a ride yesterday, I noticed the remnants of an old water works near the road (on Route 79 east of the town of Richford, NY).
(Sorry about the picture quality - I had to splice a couple of cell phone photos together...)
A small stream follows the road, and a man-made foundation for a water wheel of related water works was evident. The grade of the stream on this section is around 7%. I assume it was for either an undershot or breastshot wheel. You could also see where the channel was lined / surfaced with concrete. I'd love to know more about this structure. I need to ask the local historical society for more info. Any thoughts?