Italy still uses thousands year old aqueducts!
"Bridges for conveying water, called aqueducts or water bridges are constructed to convey watercourses across gaps such as valleys or ravines. The term aqueduct may also be used to refer to the entire watercourse, as well as the bridge."
--It pretty much carried water in a canal form. It was used around the Roman Empire, and allowed water to be available nearly everywhere their Empire stretched. What kept the water moving was the angles of the aqueducts.
"The word is derived from the Latin aqua ("water") and ducere ("to lead").".
Really amazing how the Romans calculated this kind of mechanism that helped transport water. We have pipes now, we definitely developed that kind of idea because of the aqueducts!
Here is a video that gives a demonstration of how an aqueduct works!