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How Roman aqueducts moved water without pumps.

An aqueduct is essentially a channel many kilometres long with a tiny gradient: the line to Nîmes drops only 12.6 metres over 50 kilometres, about 25 centimetres per kilometre. Gravity suffices if the slope never breaks. So the Romans dug tunnels through hills and built bridges like the 49-metre Pont du Gard. The famous arches are the visible part.

Useful: Most infrastructure, then as now, lies invisibly underground.

Source: fr.wikipedia.org

Antike Rom Technik

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