Attanagalu Oya

Attanagalu Oya (Sinhala: අත්තනගලු ඹය) is a river in Gampaha District, Sri Lanka.[1][2]

Attanagalu Oya
Attanagalu Oya, near Dandugama
Native nameඅත්තනගලු ඹය  (Sinhala)
Location
CountrySri Lanka
Physical characteristics
SourceKegalle District
 • locationGalapitamada
MouthNegombo Lagoon
 • location
Dandugama
 • coordinates
07°10′N 79°53′E
Length76 km (47 mi)
Basin size727 km2 (281 sq mi)
Discharge 
 • average40 m3/s (1,400 cu ft/s)
 • minimum20 m3/s (710 cu ft/s)
 • maximum100 m3/s (3,500 cu ft/s)

The length of the river is approximately 76 km, with a drainage basin of 727 km2.[1][3][4] It originates from Galapitamada area in Kegalle district and drains into the Negombo Lagoon as Dandugam Oya.[5][6] The river is often a cause of floods to low-lying areas in the Gampaha district.

Hydrology

The river originates from lower peneplains of Kegalle District in Galapitamada area. It is joined by the left tributaries Basnagoda Oya and Waharaka Oya in Karasnagala and later joined by Algama Oya further down stream close to Attanagalla town.

Oruwal Oya and Diyaeli Oya joins the Attanagalu Oya in Gampaha. The river then flows in a northerly direction and joined by Kimbulapitiya oya and Mapalan Oya in Madawala (near Katunayake) and forms Dandugam Oya, Attanagalu Oya-Dandugam Oya river system then finally discharges into Negombo Lagoon in Dandugama Area where Muthurajawela meets Negombo Lagoon. Close to its mouth it is also joined by Ja-Ela which is a diversion of the Oruwal Oya.

Tributaries
  • Left
    • Basnagoda Oya
    • Waharaka Oya
    • Oruwal Oya (sometimes referred to as Uruwal Oya)
    • Ja Ela
  • Right
    • Algama Oya
    • Diyaeli Oya
    • Kimbulapitiya Oya/ Dunagaha Ela
    • Mapalan Oya [5][4]

References
  1. Pathirana, C. D. K.; Bandara, N. J. G. J.; Jayaweera, C. D. (2012-12-20). "Investigation of the pollution extent of Attanagalu Oya". Proceedings of International Forestry and Environment Symposium. 17. doi:10.31357/fesympo.v17i0.1054 (inactive 2021-01-13). ISSN 2235-9427.CS1 maint: DOI inactive as of January 2021 (link)
  2. "preliminary_study_on_pethia_reval_meegaskumbura_Pethiyagoda_2008_and_other_related_ichthyofauna_of_Attanagalu_oya_river_basin_Sri_Lanka".
  3. "International Forestry and Environment Symposium".
  4. Wijesekera, Sohan; Perera, L (2016-05-02). "Key Issues of Data and Data Checking for Hydrological Analyses - Case Study of Rainfall Data in the Attanagalu Oya Basin of Sri Lanka". Engineer: Journal of the Institution of Engineers, Sri Lanka. 45 (2): 1. doi:10.4038/engineer.v45i2.6936.
  5. "Preliminary Groundwater Assessment and Water Quality Study in the Shallow Aquifer System in the Attanagalu Oya Basin" (PDF).
  6. "Template for Submission of Scientific Information to Describe Areas Meeting Scientific Criteria for Ecologically or Biologically Significant Marine Areas" (PDF).
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