Shaduf
An irrigation system involving a counterweight to bring water up from a well or the river and into a channel; human labor is required to pull the system down to the water level. This was one of three irrigation systems used in Egypt, the other two being the saqiya and Archimedes screw, neither of which required human labor to operate. Despite this, the shaduf was still very common because it was comparatively easy and inexpenive to manufacture and operate.
