Aqua Alsietina

The Aqua Alsietina is an ancient Roman aqueduct, erected sometime around 2 BC[1]: 179 [2]: §11 (p. 352-3)  during the reign of emperor Augustus.

The daily discharge of Aqua Alsietina was 15,680 m3 (20,510 cu yd)[3]: 347 , though by the 1st century AD the flow was not much more than a trickle[4]: 472 .

Only when other aqueducts serving the Transtiberine parts of the city were not in use was water from Aqua Alsietina used as an emergency supply[4]: 484 .

It was joined by the aqua Traiana, probably in 109 AD, to share a common lower path into Rome, though their routes are uncertain.

An inscribed stone slab was found in 1887 near the Via Claudia, the only ancient written record of the Aqua Alsietina.