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There are 2 different potential energies involved. The height is the main but there is energy in the velocity of water as well. I remember the first time I encountered a ram pump lifting water without any power input. I thought it was some kind of perpetual motion machine or an optical illusion. You can have a stream on you property with only a few feet of elevation change but then lift a smaller portion of that water to a pretty good height above the stream without any input of outside energy.
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