Native Americans have been building canals in Arizona for at least 3,500 years. The oldest waterways archaeologists have found date to 1500 BCE and diverted water from the Santa Cruz River in Tucson. Through trial and error, these ancient river people accumulated knowledge that was passed down from generation to generation, Huckleberry notes. "So, by the time you get to the Hohokam, they were skilled hydraulic engineers."
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