The complex comprises two aqueducts that run along a hilly area flanking the fosso Malafede and delimited by two low hills. The excavation was carried out with sample trenches. The two channels run at different heights for the whole of the length examined, one on top of the other under the hills, and parallel where they run close to or above the surface. They were built in sequence, as both sides of the first channel are faced, while only the outside wall of the second is. The earlier aqueduct is lower, 1.30m. wide, with foundations in opus caementicium and outer walls in _opus reticulatum_ and _opus mixtum_, with clear patches and restorations. The channel is lined with _opus signinum_ with quarter-round moldings at the junction of the walls and floor, and is covered with tiles placed a _cappuccino_ where it runs above ground and with masonry below ground. The second aqueduct is in _opus mixtum_, with its channel 1.40 m. wide, and also lined with _opus signinum_. Where it runs along the top of the earlier channel in the points where they enter the hill, the top of the first was reinforced with a saddle in _opus caementicium_. In the same sector two inspection wells were found at ground level: these show the line of the specus as they run underground. The slope measures 1:1000 for the first channel, and 2:1000 for the second. This is sufficient to carry the water between this area and Ostia. The springs which filled them were probably found at Trigoria. (Margherita Bedello Tata)