Excerpts from Books and Wikipedia
"The first aqueduct to bring water into the growing conurbation was constructed in 312 BCE, a watercourse that ran mostly underground for some 10 miles from the nearby hills, not one of those extraordinary aerial constructions that we often now mean by ‘aqueduct’. This was the brainchild of a contemporary of Barbatus, the energetic Appius Claudius Caecus, who in the same year also launched the first major Roman road, the Via Appia (the Appian Way, named after him), leading straight south from Rome to Capua." [Beard: SPQR, p. 136]