Abstract
The authors describe an ingenious Aztec form of irrigated field system and assess its costs and benefits. Swamps were reclaimed by digging channels by hand and the excavated soil used to construct embanked fields (chinampas). The banks were anchored by planted trees and the trees, the crops and the water channels created a sheltered space which itself raised the temperature and increased productivity. The construction of the whole system took 25 million person-days spread over 40 years. In their study of the energetics of construction, the authors show that this project, forced on the local community, was within their capacity and comparable to the labour expended on the production of cloth.
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