Here's a good article explaining in detail these dike and other water control systems engineered by the Mexica. Really impressive. https://www.mexicolore.co.uk

Here's a good article explaining in detail these dike and other water control systems engineered by the Mexica. Really impressive. https://www.mexicolore.co.uk/aztecs/home/water-in-valley-of-mexico https://www.mexicolore.co.uk/aztecs/home/water-in-valley-of-... Also explains why Cortés destroyed them: it was to destroy their fresh water supply during a siege.