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Table  06  (Geo., Topography )
River Basins in Sri Lanka ,
Geo06e
Name of Basin  Catchment Area 　　　　　　　（ Km2 ） Precipitation Volume to (x106 m3) Discharge Volume to Sea (x106 m3) Discharge of Precipitation (%)
Kelani Ganga 2,278 8,692 5,474 62.0
Bolgoda Lake 374 1,080 7,506 69.5
Kalu Ganga 2,688 10,122 7,862 77.0
Bentota Ganga 622 2,213 1,538 69.5
Madu Ganga 59 214 149 69.5
Madampe Lake 90 259 171 69.5
Telwatta Ganga 51 148 98 69.5
Ragama Lake 10 30 20 69.5
Gin Ganga 922 3,039 1,903 62.0
Koggala Lake 64 127 64 50.5
Polwatta Ganga 233 768 299 39.0
Nilwala Ganga 960 2,775 1,104 40.0
Sinimodera Oya 38 62 20 33.5
Kirama Oya 223 357 120 33.5
Rekawa Oya 755 121 40 33.5
Urubokka Oya 348 738 198 27.0
Kachigal Ara 220 255 56 22.0
Walawe Ganga 2,442 9,843 2,165 22.0
Karagan Oya 58 67 15 22.0
Malala Oya 399 434 74 17.0
Embilikala Oya 59 62 15 23.5
Kiridi Oya 1,165 1,606 476 30.0
Bambawe Ara 79 84 28 33.0
Mahawilawa Oya 13 15 5 33.0
Butawa Ara 38 44 15 33.0
Menik Ganga 1,272 1,472 486 33.0
Katupila Ara 86 100 33 33.0
Kurunda Ara 131 151 50 33.0
Namadagas Ara 108 124 41 33.0
Karambe Ara 46 53 17 33.0
Kumbukkan Oya 1,218 1,140 774 36.0
Bagura Oya 92 106 39 34.5
Girikula Ara 15 18 6 34.5
Helawa Ara 51 82 28 34.5
Wila Oya 484 653 215 33.0
Head Oya 604 967 394 41.0
Karanda Oya 422 676 196 29.0
Seymena Ara 51 82 25 31.0
Tandiadi Ara 22 50 16 31.0
Kangikachchi Ara 56 127 39 31.0
Rufus Kulam Aru 35 77 24 31.0
Pakkela Oya 184 415 129 31.0
Ambalam Oya 115 259 80 31.0
Gal Oya 1,792 4,031 1,250 31.0
Andella Oya 522 869 286 33.0
Thumpankeni Tank 9 20 8 40.5
Namakada Aru 12 26 11 40.5
Mardipattu Aru 100 223 91 40.5
Patande Aru 100 225 91 40.5
Wedi Aru 26 58 23 40.5
Magalawatawan Aru 346 615 290 48.0
Mundeni Aru 1,280 2,236 859 38.0
Miyangolla Ela 225 362 118 32.5
Maduru Oya 1,541 2,476 805 32.5
Puliyanpotha Aru 52 84 27 32.5
Kirimechchi Odai 77 123 40 32.5
Bodigoda Aru 164 303 81 27.0
Mandan Aru 13 21 7 34.0
Makarachchi Aru 37 60 20 34.0
Mahaweli ganga 10,327 26,804 11,016 41.0
Kantale Basin 445 703 150 21.0
Palapotta Ara 69 111 27 24.5
Pan Oya 143 230 58 24.5
Pankulam Aru 382 594 168 28.0
Kunchikumban Aru 205 329 77 23.5
Pulakutti Aru 20 33 8 23.5
Yan Oya 1,520 2,269 300 19.0
Mee Oya 90 144 28 19.5
Ma Oya 1,024 1,510 306 20.0
Churiyan Aru 74 119 28 23.5
Chavar Aru 31 49 11 23.5
Paladi Aru 61 98 23 23.5
Nay Aru 187 300 71 23.5
Kodalikkallu Aru 74 119 28 23.5
Per Aru 374 547 122 27.0
Palu Aru 84 136 31 23.5
Maruthapilly Aru 41 66 15 23.5
Toravil Aru 90 144 33 33.5
Piramenthal Aru 82 132 30 23.5
Netheli Aru 120 164 32 19.0
Kanakarayan Aru 896 1,264 24 19.0
Kalavalappu Aru 56 84 13 15.0
Akkarayan Aru 192 261 44 17.0
Mandekal Aru 297 404 75 18.0
Pallavarayankaddu Aru 159 255 45 17.5
Pali Aru 451 637 110 17.0
Chippi Aru 66 107 20 19.0
Parangi Aru 832 1,234 273 21.0
Nay Aru 560 630 123 20.0
Aruvi Aru 3,246 4,592 568 12.0
Kal Aru 210 290 36 12.5
Modaragam Aru 932 1,288 161 12.5
Kala Oya 2,772 4,424 587 13.0
Moongil Ara 44 60 9 13.5
Mi Oya 1,516 2,176 338 16.0
Madurankuli Aru 62 100 25 25.0
Kalagamu Oya 151 209 52 25.0
Rathambala Oya 215 297 74 25.0
Deduru Oya 2,616 4,794 1,608 34.0
Karambalan Oya 589 1,095 251 23.0
Ratmal Oya 215 297 92 31.0
Maha Oya 1,510 4,132 1,608 29.0
Attanagalu Oya 727 2,483 1,569 63.0
© ２００４， KRI (Kusaka Research Institute)
Source:  
Revised Coastal Zone Management Plan, Sri Lanka 1997, Coast Conservation Department
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.