What water-control device did Leonardo da Vinci design with a screw-like lifting mechanism?

Leonardo da Vinci studied and designed versions of the Archimedes' screw for lifting water.

An Archimedes' screw consists of a helical surface wrapped around a shaft inside a tube or trough. Turning the shaft carries water upward from a lower level to a higher one. Leonardo's drawings explored the geometry and practical use of this established hydraulic machine.

The device is named after Archimedes, who is traditionally credited with its invention in ancient Greece. Leonardo therefore did not originate the basic screw pump. His importance lies in recording, analyzing, and adapting hydraulic mechanisms during the Renaissance.

This machine is different from Leonardo's aerial screw, the famous spiral flying-machine concept. Both involve a helical form, but one raises water and the other was imagined as a means of producing lift. Keeping those inventions separate avoids a common source of confusion.