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I'm sorry but as an engineer there is no way aqeduct is from 1670, it looks mid 1800s (and definitely no earlier than 1800).

Edit: Google shows canal du midi is indeed from 1670 but this aqeduct section is later, completed in 1858 (the order was decreed by Napoleon himself according to wiki)

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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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