Sigiriya Water Gardens: underground terracotta pipes and gravity fountain operation?
How did 5th-century hydraulic engineers design gravity-driven fountains in the Sigiriya pleasure gardens that still operate during the rainy season?
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3 Answers from travellers
The western water gardens of Sigiriya showcase sophisticated 5th-century hydraulic engineering designed under King Kasyapa. The Miniature Water Garden and Fountain Garden utilize underground interlocking terracotta pipe conduits connecting uphill storage moats to paved limestone basins. Operating entirely on gravity without mechanical pumps, hydraulic pressure (head) forces water upward through perforated circular limestone plates set flush with the ground. During the monsoon rainy season when reservoir channels are full, the pressure creates natural fountain jets that spray water continuously up to 1 meter high.
Limestone conduits running beneath garden causeways circulate cool water to reduce ground-level temperatures for residents strolling between pavilion terraces.
During dry months (May to September), fountains remain dry; visitors can inspect the exposed limestone nozzles and brick drainage channels clearly.
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