Summary
Archaeologists preparing for the expansion of a Tucson, Ariz., wastewater treatment facility have discovered the remains of the earliest known irrigation system in the Southwest, a farming community that dates to at least 1200 B.C.
That predates the much more sophisticated Hohokam Indians' canal system, which crisscrossed what is now Phoenix, by 1,200 years. The find suggests that the people who inhabited the region began with relatively simple irrigation systems and built up to more complex projects as the climate became hotter and drier.See the full content of this document
Extract
Earliest-Known Irrigation System Unearthed in Ariz.
"These . . . canals . . . are the most extens...
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