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Thanks for pointing out this mistake. Here is one of the canal bridges which have been built around 1670.

https://fr.m.wikipedia.org/wiki/Pont-canal_du_R%C3%A9pudre

and one from 1690: https://en.wikipedia.org/wiki/Cesse_Aqueduct

Ah yes, they are both very nice structures that would have taken some good engineering at the time. I wonder what would have been used as the impermeable water barrier - puddle clay or similar?

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