Looking at , it seems clear that it works by letting the source water go downhill and gain momentum, then concentrating that pressure on a smaller volume of water at the bottom so that it can raise some of the water higher than the source. It dumps some of the source water at the low point. It trades some volume for increased pressure, one of the basic principles of pressure and area.
A hydraulic ram, or hydram, is a cyclic water pump powered by hydropower. It takes in water at one "hydraulic head" (pressure) and flow rate, and outputs water at a higher hydraulic head and lower flow rate.
Looking at [this diagram of a ram pump](https://cdn.permaculturenews.org/images/ram_pumps_article_image002.jpg), it seems clear that it works by letting the source water go downhill and gain momentum, then concentrating that pressure on a smaller volume of water at the bottom so that it can raise some of the water higher than the source. It dumps some of the source water at the low point. It trades some volume for increased pressure, one of the basic principles of pressure and area.
> A hydraulic ram, or hydram, is a cyclic water pump powered by hydropower. It takes in water at one "hydraulic head" (pressure) and flow rate, and outputs water at a higher hydraulic head and **lower** flow rate.
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