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A catchment site within the system is referred to as a wewa (වැව) in Sinhala, and this term is translated into English as "tank". [7]These tanks are connected in a series, referred to as a cascade, so that an ephemeral waterflow can be used, stored for future use, or conveyed elsewhere. [7]
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 ...
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.
The Biyagama Water Treatment Plant or BWTP is a water treatment facility located at the bank of Kelani River, in Biyagama, Sri Lanka. At a daily output capacity of 160,000,000 L / d (1,900,000 L/ ks ), it is the second largest water treatment facility in the country.
The tank was built by Kulakkottan (604-614 AD) and further developed by King Parakramabahu the Great. [2] It was also known as Gangathala Vapi at the time. The reservoir has a catchment area of 216 km 2 (83 sq mi) and a capacity of 135 million cubic metres (4.8 × 10 9 cu ft).
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Responsibility for the tank passed from the Public Works Department to the Department of Irrigation in 1900. [10] By the late 1960s the tank's bund was 4.5 mi (7 km) long and 10 ft 4 in (3 m) high whilst the tank's storage capacity was 26,600 acre⋅ft (32,810,617 m 3) and its water spread area was 4,550 acres (1,841 ha). [1]
Tissa Wewa is a reservoir in Tissamaharama, thought to have been constructed in the 3rd century BC, either by Mahanaga of Ruhuna or his successor Yatala Tissa of Ruhuna, in order to irrigate paddy lands and supply water to the flourishing city of Tissamaharama.