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Romans also built the second kind (minus the treatment plant), such as in Lyon. They preferred to use open air aquaducts, when possible, for economic reasons. At the time, bridges were much cheaper than piping capable of dealing with pressure. However, they could and did ake use of the inverted siphon when it made sense to do so.
They were crazy advanced. in Pompej expander pieces were found that suggest that they used them to defraud of the water tax.
Also there were aqueduct lines that gad a height difference of 2m over a km. that translates to 2mm on a meter. You couldnt even measure such a tiny difference without special equipment today.
How does the intake draw water into a hole above the water line?
