🛠️ Invention or technique

Kallanai dam (Grand Anicut)

Presa de Kallanai (Gran Anicut)

Date
c. century II · confidence low
Place
Kallanai, Thanjavur, Tamil Nadu, India
Credited to
Karikala Chola (attributed)
People
👤 Karikala Chola100–200
Field
Tools

What it is

Rough-stone weir about 300 m long that diverts the Kaveri river towards the delta for irrigation. It is one of the oldest hydraulic works in the world still in use.

The attribution to Karikala comes from Tamil literature; the current structure was heavily reworked by British engineers from 1804.

What it led to

  • irrigation of the Kaveri delta, granary of southern India
  • reconstruction and study by Arthur Cotton (19th century)

Links

Sources✓ verified 2026-09-23