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Ancient Bisokotuwa sluice-gate physics: hydrodynamic energy dissipation in tanks?

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M
Mia•925 rep

What hydraulic engineering principle enabled 3rd-century BC Sinhalese builders to release massive volumes of pressurized deep water through earthen bunds without blowouts?

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5 Answers from travellers

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The Bisokotuwa (literally "queen-enclosure" or valve-pit) was an extraordinary hydrological invention that predated European deep-water sluices by well over a millennium. By constructing an open vertical stone chamber inside the tank’s earthen embankment, incoming water under immense static pressure was diverted into the pit, where hydraulic turbulence and atmospheric aeration dissipated kinetic energy before the water exited through narrow stone conduits into irrigation canals. This stopped scouring vortices that would have liquefied and breached the core clay embankment.

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Eng Karunaratne•1840 rep

Remarkable examples of intact granite Bisokotuwa chambers can be inspected at Maduru Oya reservoir, Minneriya, and the Great Basses-linked reservoirs of Tissa.

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M
Mia•925 rep

Modern irrigation engineers renovating ancient tanks during the Mahaweli Development project retained original Bisokotuwa positions because ancient hydraulic alignment matched natural catchment contours.

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Pradeep•1640 rep

The masonry joints inside the stone valve towers were joined with fine lime and termite-resistant natural bitumen without Portland mortar.

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Prof Gamini•1890 rep

King Parakramabahu I expanded these systems in the 12th century with his famous decree that not a single drop of water from rain should flow into the ocean without serving human needs.

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Sora•915 rep

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