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an aqueduct constructed by Augustus (and therefore also called Augusta), which drew its supply from the lacus Alsietinus (Lago di Martignano), with some additions near Careiae (Galera) from the lacus Sabatinus (Lago di Bracciano), 6 miles to the right of the fourteenth mile of the via Clodia. It was 22,172 paces long, of which 358 were on arches. Its supply was only 392 quinariae, all of which was used outside the city. The quality of the water was indeed so bad that it was probably intended mainly for the NAUMACHIA AUGUSTI (q.v.), behind which it ended, the surplus being used for gardens and irrigation, except when the bridges were under repair, and it was the only supply available for the Transtiberine region. Frontinus' statement that in level it was the lowest of all (Frontinus, de aquis i. 4 , 11, 8, 22; ii. 71, 85; Not. app.; Pol. Silv. 545, 546) requires qualification. A portion of its channel has recently been discovered to the south of that of the AQUA TRAIANA, and at a considerably lower level (Mem. Am. Acad. vi. 137-146). The identification of its channel and terminal castellum with the remains described by Bartoli, Mem. 58, ap. Fea, Misc. i. 237 (for which see HJ 640, 651, 655), which lay a good deal further to the north, below Tasso's oak, must therefore be given up. The aqueduct is referred to in an inscrip- tion of Augustus (CIL vi. 31566=xi. 3772 a; cf. NS 1887, 182), which mentions formam Mentis attributam rivo Aquae Augustae quae pervenit in nemus Caesarum. See Jord. i. I. 472; LA 342-344; LR 53; LF 33; YW 1926-7, 104; and cf. NAUMACHIA AUGUSTI.

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