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The tank cascade system (Sinhala: එල්ලංගාව, romanized: ellaṅgāva) is an ancient irrigation system spanning the island of Sri Lanka. It is a network of thousands of small irrigation tanks (Sinhala: වැව, romanized: wewa) draining to large reservoirs that store rainwater and surface runoff for later use.
A wealth of river basin-based water heritage is abundant in Sri Lanka. [3] Reservoirs of Sri Lanka are different from the water tanks seen in ancient civilisations or bodies of water collected for purposes such as generation of electricity or supplying water for consumption.
The first tank which can be identified with certainty was built by King Pandukabhaya, who reigned from 437 to 367 BC. It is said that he had three tanks built, namely Abhaya Wewa, Gamini Wewa, and Jaya Wewa. Of these, only one, Abhaya Wewa, can be identified with an extant tank, Basawakkulama Wewa.
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The tank's design, including the use of a solid rock outcrop as the spillway, indicates sophisticated engineering from the Anuradhapura era. [ 4 ] Primary sources like "Padaviya Reservoir Project" by H De S Manamperi and historical records note Padaviya's significance as a large town of commercial and religious importance by the 11th century.
A tank cascade is a system of irrigation tanks in single or multiple chains where water from a higher tank flows into lower tanks. Examples of tank cascades include Sri Lanka's tank cascade system , [ 6 ] the Indian city of Bangalore's cascading lakes in the Varthur lake series, [ 7 ] and the Indian city of Madurai 's Vandiyur tank cascade system.
The tank was renovated several times in the past as in the period of British Governor Sir William Henry Gregory (1872–1877 [1] and Sir Arthur Hamilton-Gordon (1883–1890). [6] After the British rule in the country and in 1958, the tank's bund was reconstructed connecting the tank with Balalu Wewa. [7] [4]
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