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Ancient cave drip-ledge (Katarama) chisel engineering: surface tension rainwater diversion?

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K
Kenji Folio•915 rep

What exact inward-sloping chisel angles and groove depths did ancient stonecutters carve along rock shelter brows to prevent monsoonal rainwater seepage into monastic cells?

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✓Accepted Answer

The drip-ledge (Katarama) is a ubiquitous architectural feature of ancient Sri Lankan Buddhist rock shelters dating from the 3rd century BC to the 1st century AD (such as Mihintale, Dambulla, and Vessagiriya). Master stonecutters climbed sheer cliff faces to chisel a deep horizontal groove along the overhanging rock brow. The cut consists of an inward-sloping groove 5 to 10cm wide with a sharp, acute undercut lower lip. As torrential monsoonal rainwater sheets down the cliff face, water reaches the sharp cut, breaking surface tension adhesion. Rainwater drops cleanly to the ground below as a curtain of drips, leaving the cave interior completely dry.

38
G
Guru Dharmasena Wood•1830 rep

Immediately beneath the drip-ledge, stonemasons chiseled Early Brahmi donor inscriptions recording the gift of the cave to the Buddhist Sangha by royalty or merchants.

21
K
Kenji Folio•915 rep

Katarama ledges have functioned without maintenance for over 2,200 years, preserving fragile ancient plaster paintings on interior cave ceilings from water decay.

17
D
Dr Senarath Palm•1890 rep

Masonry chisels used by ancient stonecutters were forged from high-carbon wrought steel capable of incising crystalline metamorphic granulite and charnockite.

14
E
Eng Chathura Water•1860 rep

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