Sigiriya underground terracotta pipeline hydraulics: pressure head and ceramic slip-joint collars?
What ceramic firing temperatures and interlocking socket collars kept Sigiriya's 5th-century underground water pipes watertight under gravitational pressure?
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3 Answers from travellers
The water garden irrigation system at Sigiriya utilized underground terracotta pipeline networks engineered to transport water across terraced boulder gardens without leaking. High-fired ceramic pipe sections (each 50cm long with tapered socket-and-spigot joints) were fitted together and sealed with hydraulic lime-and-clay putty collars. Fired at temperatures exceeding 900°C, the low-porosity ceramic pipes withstood internal hydrostatic pressure head generated by elevation drops from the Sigiriya reservoir, operating gravity fountains on lower garden terraces successfully.
Excavated sections of ancient terracotta piping are exhibited in the Sigiriya archaeological museum at the base of the rock fortress.
Park maintenance teams inspect subterranean stone inspection chambers periodically to clear silt and root blockages from ancient conduits.
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