(7) Van Deman describes it as having " a square passage with a rounded roof cut in the soft tufa of the hill and lined with cut-stone walls with a broad shelf on both sides The technique so far as reported was very crude" (8) She believes it was used for about 150 years before it fell into disuse and was subsequently modified and abandoned and modified again. Built between 272- and 269 B.C., the second of Rome's aqueducts drew its water from the river above Tivoli.


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