How does the Sumerian Water clock work?

The Sumerian water clock, or clepsydra, operated by measuring the flow of water from one container to another. As water dripped from a higher tank into a lower one, the time required for the water to fill the lower container indicated the passage of time. The clock was calibrated to provide a consistent measure, often using markings on the vessel to denote different time intervals. This innovative device allowed the Sumerians to track time more accurately than relying solely on sundials or other methods.