During a rescue excavation prior to the construction of a house, undertaken between July and November in the locality of Settebagni along the via Salaria (at km 14), an ancient hydraulic structure was uncovered. The investigation, still to be completed, brought to light a coffer-dam for water collection and settling, with one pipe for bringing water in and two pipes for its distribution. The central structure was faced internally with a thick layer of waterproof opus signinum. On the west side it fed, via a hole that had been readapted several times, into the two distribution conduits. One of the latter comprised a single row of tufa blocks into which a small open channel had been cut, the other, slightly to the north, was made of terracotta pipes. A first analysis of these structures suggests a long period of use beginning in the late Republican period. The fill produced coarse ware pottery, amphora and dolia body sherds, lamps and imported African pottery, probably from the drainage levels in the terrain around the system. It may be suggested that the system served structures situated further down hill, closer to the route of the via Salaria.