In an undeveloped area between via Fosso dell’Osa and via Ponte di Nona nine test-pits were dug prior to the construction of a sewer. These revealed the presence of tanks, low walls, wells, channels and cuniculae. Rock-cut ditches and grooves were also observed. These structures, of probable Roman date, seem to to be part of the area’s agricultural system. That is, a system for the collection and distribution of water and traces which may have been left in the bed-rock by the agricultural activities themselves. Worth noting is a modest dry-stone wall, built with tufelli, which partially delimits to the NE a cut in the tufa bed-rock. This may have been part of a drainage system, as suggested by the presence of similar structures in the vicinity and the traces of a channel which runs into the ditch from the west. (Stefano Musco, L. De Michelis)