The Aqua Julia or Aqua Iulia is a Roman aqueduct built in 33 BC by Agrippa. It was repaired and expanded by Augustus from 11–4 BC.
The springs of the Aqua Iulia are situated approximately a half-mile north of the abbey of Grottaferrata. Frontinus stated that the springs were two miles to the right of the twelfth mile of the via Latina. The length of the Aqua Iulia was reported as 15,426 1/2 paces. The water supply was estimated to be 1206 quinariae, or 48,000 m3 during a 24-hour period. Several cippi are known, all dated from the time of Augustus.
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