Tank cascade system
Ancient irrigation system in Sri Lanka / From Wikipedia, the free encyclopedia
The tank cascade system (Sinhala: එල්ලංගාව, romanized: ellangāva) is an ancient Sri Lankan irrigation infrastructure. The system is a network of small tanks draining to large reservoirs that store rainwater and surface runoff for later use.[1][2] Originating in the 1st millennium BCE,[3][4] the system was designated as a Globally Important Agricultural Heritage System by the United Nations Food and Agriculture Organization in 2017.[5] Centralized bureaucratic management of large-scale systems was implemented from the 3rd to the 13th centuries.[2]