Pumps operated by the rise and fall of water

A pumping system to be operated by flowing water from an elevated source, said system including at least one pump, said pump including a piston and a fixed cylinder establishing a vertically expansible chamber, said piston including a float, a reservoir in which the pump is located, a first valve controlled delivery conduit communicating between the reservoir and the elevated source of flowing water to thereby enable the reservoir to be flooded in order to raise the float from a first position and expand said chamber, a valve controlled discharge conduit communicating the bottom of the reservoir with a lower level conduit to affect drainage thereof and thereby lower the float and contract the chamber, a second valve controlled delivery conduit entering the bottom of the chamber and communicating with the elevated source of flowing water, a second valve controlled discharge conduit in communication with the bottom of said chamber and connected to a turbine, said valves being operated to admit water into the reservoir to raise said float and admit water into the chamber, then said valves being operated to drain the reservoir and discharge water from the chamber, said float further including valve controlled means operable to admit ballast water when the reservoir is flooded in order to increase the head on the chamber, and then drain said ballast water when the float is in said first position.