Sri Lanka had a peak in reservoir building technology during the mid-Anuradhapura Kingdom era to Polonnaruwa Kingdom Era (1017-1236). Most of the largest reservoirs in the country were built during this period, including the Parakrama Samudraya, the largest one constructed by King Parakramabahu the Great during the 12th century, which encompassed 5 reservoirs within its 14-kilometre dam. Some other earlier giant reservoirs, such as Minnerya Wewa and Kaudulla Wewa, belong to the 3rd Century. The Kaudulla Wewa, one of the largest reservoirs built by King Mahasen, is 15 meters tall with a width of 120 meters at the base, runs for a distance of 9.2 km, has a capacity of 64 million cubic meters, and covers an area of 24.5 sq. km.
According to the chronicles, both King Vijayabahu (1055-1110) and King Parakramabahu the Great, (1153-1186) carried out rehabilitation work on the Kaudulla Wewa, which was formed by building a bund across Kaudulu Oya. The reservoir receives water along the Elahe...