Hydraulic Engineering

The Sumerians figured out how to collect and channel the overflow of the Tigris and Euphrates rivers—and the rich silt that it contained—and then use it to water and fertilize their farm fields. They designed complex systems of canals, with dams constructed of reeds, palm trunks and mud whose gates could be opened or closed to regulate the flow of water.

seated statue of the Sumerian king Gudea bearing a geometric plan of the temple