|Native name||කළු ගඟ (Kalu Ganga)|
|⁃ elevation||2,400 m (7,874 ft)|
|Length||129 km (80 mi)|
|Basin size||2,766 km2 (1,068 sq mi)|
|⁃ left||Kukule River|
Kalu Ganga (Sinhala: කළු ගඟ; literally: Black River) is a river in Sri Lanka. Measuring 129 km (80 mi) in length, the river originates from Sri Paadhaya and reach the sea at Kalutara. The Black River flows through the Ratnapura and the Kalutara District and pass the city Ratnapura. The mountainous forests in the Central Province and the Sinharaja Forest Reserve are the main sources of water for the river.
-  Development of a Flood Forecasting Model For Kalu River and Kelani River Basins in Sri Lanka using Radial Basis Function Neural Networks
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