Technology
The ancient Romans also had a complex system of aqueducts, which were used to transport water across long distances. The first Roman aqueduct was built in 312 BCE. The eleventh and final ancient Roman aqueduct was built in 226 CE. Put together, the Roman aqueducts extended over 450 kilometers, but less than seventy kilometers of this was above ground and supported by arches.
Italica
The aqueduct of 37 km total length was first built in the 1st c. AD and extended under Hadrian to add a more distant source for supplying the expanded city. It fed a huge cistern at the edge of the city which remains intact. Some of the piers of the arches are still visible near the city.