Deuteronomy 11:10

For the land whither thou goest in to possess it is not as the land of Egypt, from whence ye came out, where thou sowedst thy seed, and wateredst it with thy foot, where the need of irrigation made constant toil and watchfulness necessary, as a garden of herbs, of vegetables. That the irrigation of Egypt was literally done with the feet may still be seen from the pictures on some of the monuments; for many of the machines used for irrigation were run on the principle of the treadmill, the water thereby being lifted from a lower to a higher level.