Yan Oya

Yan Oya (Sinhala: යාන් ඔය) is a seasonal low-order river streaming through the northeastern region of Sri Lanka. Approximately 142 km long, it is the 5th longest river in the country (Seenithamby & Nandalal, 2021). It originates in the hilly areas of Dambulla and Sigiriya (Gunarathna et al., 2016).

River basin
The Yan Oya river basin, positioned entirely in the dry zone of the country, has a catchment area of about 1,538 km2 (Gunarathna et al., 2016). The catchment area receives approximately 2,371 million cubic metres of precipitation per year and approximately 17% of the water reaches the sea (Seenithamby & Nandalal, 2021). The basin is estimated to have a total of 1,500 small and large tanks, mostly in several cascades (Seenithamby & Nandalal, 2021).

See also

1) Gunarathna, M.H.J.P., Kumari, M.K.N., Nirmanee, K.G.S. and Jayasinghe, G.Y., 2016. Spatial and seasonal water quality variation of Yan Oya in tropical Sri Lanka. International Journal of Applied and Natural Sciences (IJANS) ISSN(P): 2319-4014; ISSN(E): 2319-4022 Vol. 5, Issue 4. pp.45-56
2) Seenithamby, M. and Nandalal, K.D.W., 2021. Water resource development planning around village cascades: piloting of a scientific methodology in Yan Oya river basin of Sri Lanka. Water Policy, 23(4), pp.946-969.

Location Map
This page was last updated on 16 September 2022

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