Also: Ram Pumps. You can pump water up a large distance by using a larger amount of water flowing from a low head.
Explained here:
It's interesting to think that this is a mechanical version of a boost converter. The inertia of the water acts as the inductance, the air pressure chamber on the outlet is a smoothing capacitor and the valves are the switches. Low voltage, high current in - high voltage, low current out.
It also provides a great rhythm for some country-blues!