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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 irrigation works in ancient Sri Lanka were some of the most complex irrigation systems of the ancient world. The earliest examples of irrigation works in Sri Lanka date from about 430 BCE, during the reign of King Pandukabhaya , and were under continuous development for the next thousand years.
Which was consist of 12 projects and mainly confined to four head works in the initial works of the program, including the construction of Kotmale, Victoria, Maduru Oya, Randenigala dams and the downstream development of about 60,000 ha in Systems B and C and the Minipe anicut, the Right Bank Trans basin Canal and the Ulhitiya and Ratkinda ...
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]
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
The annual discharge of approximately 145,000,000 m 3 (5.1 × 10 9 cu ft) of water from the power station is distributed out via a 3,335 m (10,942 ft) cross-basin tailrace tunnel for agriculture use on 15 km 2 (5.8 sq mi) or existing land and 45 km 2 (17 sq mi) of new lands, including irrigation of 14 separate tanks.
In 1902 the Director of Irrigation H. T. S. Ward came up with proposals for building a new irrigation tank on the Kanakarayan Aru in northern Ceylon. [4] Work in the tank, which had a catchment area of 227 sq mi (588 km 2) and was to hold 26 ft (8 m) [a] of water, began in July 1902 [b] but was delayed by the World War I.
Sri Lanka is pockmarked with many irrigation dams, with its water resource distributed across nearly the entirety of the island for agricultural purposes via artificial canals and streams. Utilization of hydro resources for agricultural production dates back to the pre-Colonial era , with the current crop production now largely dependent on ...