# Roman Aqueducts ## Overview Roman aqueducts were engineering marvels that transported water over long distances using gravity, supplying cities with fresh water for drinking, bathing, and sanitation. Rome alone had 11 aqueducts delivering ~1 million cubic meters daily. Across the empire, Romans built over 200 aqueducts supplying cities from Britain to Mesopotamia. [^3] ## Key Facts - First Roman aqueduct: Aqua Appia (312 BCE) @t[=312 BCE] - Total aqueducts serving Rome: 11 (by 226 CE) @t[312 BCE..226 CE] - Combined length: ~500 km (mostly underground) @t[312 BCE..226 CE] - Daily water delivery to Rome: ~1 million cubic meters [^1] - Last aqueduct built for Rome: Aqua Alexandrina (226 CE) @t[=226 CE] ## Engineering - Gravity-fed: Maintained a consistent gradient (~1:200 to 1:4800) @t[312 BCE..476 CE] - Mostly underground channels; iconic arched bridges were only ~5% of total length - Used *opus caementicium* (Roman concrete) and lead pipes (*fistulae*) - Settling tanks and distribution castella regulated flow - Water also supported mining operations, milling, farms, and gardens [^3] ## Notable Aqueducts - Aqua Appia (312 BCE): First aqueduct, built by Appius Claudius Caecus @t[=312 BCE] [^1] - Aqua Marcia (144 BCE): Longest serving Rome at ~91 km @t[=144 BCE] [^1] - Aqua Claudia (52 CE): Begun by Caligula (38 CE), completed by Claudius; ~69 km long @t[38 CE..52 CE] [^3] - Pont du Gard (France, ~19 BCE): Three-tiered bridge, 49 m high @t[~19 BCE] [^2] - Aqueduct of Segovia (Spain, late 1st–early 2nd century CE): Still standing; date debated — Géza Alföldy's reading of the dedication plaque suggests ~98 CE (Domitian), while a 2016 coin find points to 112–116 CE (Trajan/Hadrian) @t[~98 CE..116 CE] [^4] - Aqua Alexandrina (226 CE): Last of Rome's 11 aqueducts @t[=226 CE] [^3] --- [^1]: Frontinus, *De Aquaeductu Urbis Romae* (~97 CE) [^2]: Hodge, A.T. *Roman Aqueducts and Water Supply* (2002) [^3]: Wikipedia, "Roman aqueduct" — https://en.wikipedia.org/wiki/Roman_aqueduct [^4]: El País, "Age of Segovia aqueduct revised after discovery of ancient coin" (2016) — https://english.elpais.com/elpais/2016/11/01/inenglish/1477997248_304960.html