Claudian Aqueduct. Aqua Claudia, was an ancient Roman aqueduct that, like the Anio Novus, was begun by Emperor Caligula in 38 AD and finished by Emperor Claudius in 52 AD. Together with Aqua Anio Vetus, Aqua Anio Novus, and Aqua Marcia, it is regarded as one of the four great aqueducts of Rome.
   Its mainsprings, the Caeruleus and Curtius, were situated 300 paces to the left of the 38th milestone of the Via Sublacensis. The total length was approximately 69 kilometres 45 to 46 miles, most of which was underground.
   The flow was about 190,000 cubic metres in 24 hours. Directly after its filtering tank, near the seventh mile of the Via Latina, it finally emerged onto arches, which increase in height as the ground falls toward the city, reaching over 30 metres.
   It is one of the two ancient aqueducts that flowed through the Porta Maggiore, the other being the Anio Novus. It is described in some detail by Frontinus in his work published in the later 1st century, De aquaeductu.
   Nero extended the aqueduct with the Arcus Neroniani to the Caelian hill and Domitian further extended it to the Palatine when the Aqua Claudia could provide all 14 Roman districts with water. The aqueduct went through at least two major repairs.Tacitus suggests that the aqueduct was in use by AD 47. An inscription from Vespasian suggests that Aqua Claudia was used for ten years, then failed and was out of use for nine years. The fi
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