Attanagalu Oya

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

Attanagalu Oya
Attanagalu Oya, near Dandugama
Attanagalu Oya is located in Sri Lanka
Attanagalu Oya
Native nameඅත්තනගලු ඔය (Sinhala)
Location
CountrySri Lanka
Physical characteristics
SourceKegalle District
  locationGalapitamada
2nd sourceIndurana Ela
  locationIndurana
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.

Uruwal 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 Uruwal Oya.

Tributaries

  • Left
    • Basnagoda Oya
    • Waharaka Oya
    • Uruwal Oya
    • Ja Ela
  • Right
    • Algama Oya
    • Diyaeli Oya
    • Kimbulapitiya Oya/ Dunagaha Ela
    • Mapalan Oya [5][4]

References

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