I think one of the largest examples of water-based mechanical engineering from around that time is at Barbegal [0], the greatest known concentration of mechanic

I think one of the largest examples of water-based mechanical engineering from around that time is at Barbegal [0], the greatest known concentration of mechanical power in the ancient world and The capacity of the mills has been estimated at 4.5 tons of flour per day, enough to supply bread for as many as 10,000 of perhaps 30–40,000 inhabitants of Arelate at that time. Spain mines also had very interesting (albeit slave-powered) solutions, with up to 16 wheels draining a mine over 30 vertical meters[1] (and possibly more in other sites), one of which was discovered "intact"! [2, 3] Pre-industrial era engineering in general can be very fascinating. 0. https://en.wikipedia.org/wiki/Barbegal_aqueduct_and_mills https://en.wikipedia.org/wiki/Barbegal_aqueduct_and_mills 1. https://en.wikipedia.org/wiki/Reverse_overshot_water_wheel#Examples https://en.wikipedia.org/wiki/Reverse_overshot_water_wheel#E... 2. https://www.naturalhistorymag.com/sites/default/files/media/2017/05/roman_water_wheel_jpg_15964.jpg https://www.naturalhistorymag.com/sites/default/files/media/... 3. https://www.britishmuseum.org/collection/object/G_1889-0622-1 https://www.britishmuseum.org/collection/object/G_1889-0622-...