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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.
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.
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]
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.
Yodha Ela functions in a way of a moving reservoir because of its single banking aspect which is different from the present day double banking irrigation canals'. It feeds water in an area of 470 km 2 (180 sq mi) feeding 4,630 ha (11,400 acres) of paddy lands and 120 small tanks on its way from Kala Wewa to Tissa Wewa [7]
Parakrama Samudra (or King Parakrama's sea or the Sea of King Parakrama) is a shallow reservoir (), consisting of five separate wewa (reservoirs) (thopa, dumbutulu, erabadu, bhu, kalahagala tanks) connected by narrow channels in Polonnaruwa, Sri Lanka.
Major irrigation schemes of Sri Lanka, as evident from the earliest written records in the Mahawansa, date back to the fourth century BCE (Parker, 1881; [1] Brohier, 1934). ). The purpose and determination in the construction of the irrigation systems are depicted by the words of Parakrama Bahu I, 1153–1186 CE: "Let not even a drop of rain water go to the sea without benefiting
During 1952 to 1957, the tank was rehabilitated by the Department of Irrigation of Sri Lanka. [2] The reservoir and hotel is situated with the Kaludiya Pokuna Forest archeological site. The reservoir measures 4.8 km (3.0 mi) and 2.3 km (1.4 mi) at its longest length and width respectively, with a catchment area of 102 km 2 (39.4 sq mi) and a ...
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