The aqueduct that got it's name from Gens Lulia in honor of Augusto, even though it got it's name form Gens Lulia , it is not yet officially considered, it was constructed by Agrippa in 33 a.C. Getting water from the source of the zone of Tuscolana near Tepula. It is identified with the one that can be found near the bridge of Squarciarelli, up of Grottaferrata. The duct, staring at a certain point, flowing together with Tepula in an underground tunnel purposely restructured, that gave origin to the modern toponyn of Formagrotta, until the piscina limaria which is in VII miles of via Latina, in the zone of the present Capannelle. From here , it is divided by Tepula, the mirror of Giulia continue for about 528 yd. ( 784m) until 6472 yd. (about 9,600 m) on the arch of Acqua Marcia which is properly reinforce with "bandings" in other words restructured. In the sections that still resisted you could see clearly the three canals overlapping in chronological order: in the bottom Marcia, in the center Tepula ,on the top Giulia.

Arriving in the city in the zone of Porta Maggiore , Aqueduct continues to the arcade until the Porta Tiburtina , where the duct goes again underground to arrive to Porta Viminale of the republican wall , the "castle" terminal site in the zone of ex Minister of Finance. A division of aqueduct , starting near Porta Tiburtina , using the arcade of Marcia as a support and was later changed by Nero's copper of Aqua Claudia. Another division, which is not documented, form Viminale turning back following the course of Republican wall, part from the arcade, and part from underground tunnel in, going until Porta Esquilina (then to Arch of Gallieno) which is now the church of San Vito. All in all passing 17 "castle" Complessivamente e attraverso una rete di 17 "castelli" later Giulia reform the II, III, V, VI, VIII, X, and XII urban region; which is Celio, Esquilino, Viminale and Quirinale, Fori, and Campidoglio, Palatin, and Piccolo Aventino. It already gone restoration from the part of Augusto, about 11 and 4 a.C., Aqueduct Giulio was still being extraordinarily maintained in the time of Caracalla.