I was searching the web trying to learn more water pumps for a future project when I came across this great website. It details the making or a ram pump. I am amazed at the lack of a motor or any user input. I wish I had a stream near by to try it out!
This is a pump that uses the power of water flowing downhill to deliver a supply of water to a much higher level. Pumps like this are relatively easy to build at home, for very little cost.
Learn how to make a Ram Pump