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This is a section of the aqueduct built by Trajan in 109 AD. In a study carried out by the Speleo Club of Rome published in 1999, it emerges that the real sources of the Trajan aqueduct are identified in Acqua Praecilia, located near Manziana. The initial flow of water is enriched along the way by other sources, identified during a careful study of the same aqueduct. The site in question has a broken hole in one point from which a certain quantity of water flows into a collection pool. The height of the structures reach a maximum of 15 meters and have a brick curtain that alternates with the opus reticulatum.