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Parakrama Samudra reservoir engineering: 12th-century earthen bund compaction and Ralapanawa stone facing?

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E
Eng Chathura Bund•950 rep

What ancient hydraulic methods protected the 14-kilometer earthen dam of the "Sea of Parakrama" in Polonnaruwa from monsoonal wave erosion?

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4 Answers from travellers

✓Accepted Answer

Parakrama Samudra (the "Sea of Parakrama"), engineered by King Parakramabahu I in the 12th century, consolidated five distinct ancient reservoirs into a single 2,500-hectare inland sea. Its earthen embankment stretches 14 kilometers, rising over 12 meters high. To prevent large wind-driven lake waves from eroding the clay core, ancient engineers armored the water-facing slope with Ralapanawa (rip-rap stone pitching): interlocking dressed granite boulders laid in terraced tiers. The stepped stone facing absorbed and broke incoming wave crests without dislodging compacted clay underneath.

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D
Dr Senarath CCF•1920 rep

The reservoir was engineered around the famous royal quote: "Let not even a drop of rainwater that falls on this land flow into the ocean without serving man."

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E
Eng Chathura Bund•950 rep

Submerged stone valve towers (Bisokotuwa) built into the inner bund regulate gravity-fed water release into brick-lined irrigation canals supplying paddy fields.

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M
Minoli Heritage•1850 rep

The tree-shaded roadway running along the top of the main bund offers scenic sunset cycling looking across open water toward the distant Knuckles mountains.

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Sarah Field Scout•1720 rep

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