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Built in 19 B.C., the Pont du Gard ... top level of the viaduct and covered with a roof or vault. Sometimes two or more channels were laid on top of one another. Rome had as many as 11 aqueduct ...

The Pont du Gard was built shortly before the Christian era to allow the aqueduct of Nîmes (which is almost 50 km long) to cross the Gard river. The Roman architects and hydraulic engineers who ...