Welcome to Japan, Elf-san! - Vol. 3 Ch. 15 - Conquering the Ancient Labyrinth - 1

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@InfiniteVerisimilitude On the American (Quechan) version of the Persian underground water aqueducts... The Persians had underground aqueducts, and they had an air conditioner driven by the pressure difference between ground level and a chimney. Since the air run alongside the cool mountain water, and since, as a quote on that wikipedia page suggests, the air was fresh and moist, clearly the Persians could also drive water through such pressure differentials. I wonder why they didn't do that, given they had almost a thousand years head start on the Quecha who did just that, though whether the Quecha did it to drive water uphill or just improve the overall flow rate in the Andes I wouldn't know... I wonder how tall the Peruvian pressure-differential chimneys were compared to the already 100m+ Persian access tunnels.
 

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