Water feature
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In landscape architecture and garden design, a water feature is any of a full range of fountains, pools, ponds, cascades, waterfalls, and streams. Prior to the eighteenth century they were usually powered by gravity, though the famous Hanging Gardens of Babylon are believed to have been supplied by an Archimedean screw. Other examples were supplied with water using hydraulic rams. Since the eighteenth century the majority water features have been powered by pumps. The power source was sometimes a steam engine but in modern gardens it is almost always electricity.
A modern famous example is the Diana, Princess of Wales Memorial Fountain.