How did ancient Roman fountains work without electric pumps?
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You can use a gravity pump. The source of the water is at some higher location. The pressure of this high water presses down, which causes water at a lower level to shoot upwards in a fountain.
In the modern day, water towers can do the same thing. If for whatever reason the powered water pumps in the waterworks break down, they can still pump water to all the houses because of the pressure from the water up in the water towers.
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