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Table  08   (Geo., Topography )
River Basin & Hydrology for Five Major South - West Sector Rivers 1997
Geo08e
Name Cathment Area ( Km2 ) Length          ( Km ) Zone Starting Point End District Annual Rain Fall     (mm) Mean Annual Discharge         ( Million m3 )
Deduru Oya 2,647 140 Dry + Wet Matale Chilaw Kurunegala, Puttalama 1,750 1,608
Maha Oya 1,528 132 Wet Kandy / Nuwara Eliya Negombo  Puttalam, Kurunegala,            Gampaha, Kegalle 2,500 1,608
Kelani Ganga 2,292 147 Wet Adam's Peak Colombo Colombo, Gampaha, Kegalle, Nuwara Eliya 3,600 5,474
Kalu Ganga 2,720 132 Wet Adam's Peak Kaluthara Kaluthara, Rathnapura 3,500 7,862
Gin Ganga 932 111 Wet Adam's Peak Ginthota Matara, Galle 3,500 1,903
Nilwala Ganga 971 101 Wet Adam's Peak Matara Matara, Galle 2,500 1,104 @
© QOOSC KRI (Kusaka Research Institute)
Source: 
Statistical Compendium on Natural Resources Management Sri Lanka 2000,
Ministry of Forestry & Environment 
Revised:  2003(y)/12(m)/01(d)
Chief Editor:
Dr. Milton Rajaratne (B.Com., M.Sc., Ph.D.)
      The former Head, Department of Management Studies
   @ University of Peradeniya, Sri Lanka.