Scientists have reconstructed an elaborate water system at a Greek monastery on Mount Athos, showing how monks used underground tunnels, aqueducts, and watermills to secure supplies without pumps. The earliest part of the network appears to date to the 11th century, while later additions helped sustain farming and daily life through changing seasons.
The findings, published in the journal Academia Environmental Sciences and Sustainability, focus on the Holy Monastery of Dochiariou in northern Greece. Researchers G.-Fivos Sargentis, Nikolaos Papadodimas and Demetris Koutsoyiannis of the National Technical University of Athens examined surviving structures, satellite images and the surrounding landscape to trace the network’s development.
The main channels drew water from hills above the monastery. Narrow underground passages, known as qanat-type galleries, collected groundwater and sent it downhill by gravity. Reservoirs helped regulate the flow, while separate sources made supplies less vulnerable to dry conditions or damage in one location.
How the Greek monastery’s water system grew over centuries
Researchers identified the Ktetorikon aqueduct as the probable original route. After the monastery absorbed the neighboring Kalligraphou Monastery sometime after 1350, another aqueduct extended the supply area, drawing on three underground galleries and a source called Proto Nero. Two more galleries farther uphill may date to the 19th century, according to oral tradition.
The two main aqueducts met before reaching Dochiariou and fed a pair of watermills. Water then traveled through an underground channel toward the monastery’s tower, which served as a refuge during pirate attacks. The buried route may have made the supply harder to detect or damage, the researchers said.
Based on field observations and calculations, the team estimated the combined sources could deliver about 430 cubic meters (113,600 gallons) of water a day. The mills could have produced roughly 7 kilowatt-hours of mechanical energy over 24 hours, assuming uninterrupted operation.
Gravity-fed water supported crops and saved labor
Satellite images show roughly 11 hectares (27 acres) of present-day cultivated land near the historic aqueducts. Using modern climate records and an assumed irrigated share of 55%, researchers estimated how much water crops would need during dry summers. Gravity-fed delivery also spared the work of raising water from wells.
That avoided lifting work could amount to about 5,750 kilowatt-hours of mechanical energy annually for those fields, based on the study’s assumptions. The authors called the network “energy-producing and energy-saving infrastructure.”
But several tunnels no longer operate, and parts of the aqueduct routes were reconstructed from incomplete remains. Today’s fields and climate records also cannot establish precisely how the system worked centuries ago. The findings suggest that combining multiple water sources, storage, and gravity could offer lessons for remote communities facing water shortages.
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