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Archimedes screw

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The Archimedes Screw is still used today in some limited applications (usually electrically-powered), and can range in size from a quarter of an inch to nearly 4 meters (12 feet) in diameter. A large screw or banks of screws may be used to pump rainstorm runoff or to lift water or wastewater, for example.

 

 

==Acknowledgements==

* [http://www.waterencyclopedia.com/Po-Re/Pumps-Traditional.html#b Pumps, traditional]. Waterencyclopedia.com.

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