Results
| Country: | Sri_Lanka
| | Station: | Kappachchi | | River: | MalwattuOya | | Area: | 2121 km2 | | Lat: | 8.6 | | Lon: | 80.26 | | Source: | RivDIS | | PointID: | 144 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1965 | | Ending Year: | 1984 | | Total Years: | 20 | | Total Usable Years: | 16 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1965 | 3.6 | 6.4 | 2.4 | 5.2 | 3.5 | 0.8 | 0.6 | 1.4 | 0.3 | 14 | 18 | 185 | 20.1 |
| 1966 | 14 | 6.4 | 5 | 4.1 | 13 | 3.5 | 2.4 | 3.7 | 4.1 | 15.5 | 169 | 16 | 21.39 |
| 1967 | 16 | 13 | 5.4 | 2.3 | 3.6 | 3.2 | 1.8 | 1.3 | 0.4 | 2.9 | 9.2 | 173 | 19.34 |
| 1968 | 6.9 | 4.8 | 3.5 | 1.8 | 1 | 1.8 | 0.8 | 0.4 | 0.3 | 0.9 | 4.5 | 5.6 | 2.69 |
| 1969 | 3 | 2.1 | 0.8 | 1.2 | 1.2 | 0.5 | 0.3 | 0.4 | 0.2 | 24 | 7.8 | 32.5 | 6.17 |
| 1970 | 27 | 16.5 | 4.5 | 3.8 | 5.3 | 4 | 3.2 | 2.5 | 2.7 | 4.3 | 16 | 16 | 8.82 |
| 1971 | 20 | 7.5 | 5.8 | 7.1 | 8.4 | 2 | 1.6 | 1.8 | 2.3 | 4.6 | 2.7 | 56 | 9.98 |
| 1972 | 9 | 5.9 | 4.6 | 5.2 | 10.5 | 5.2 | 3.8 | 3.1 | 1.4 | 17.5 | 16 | 34.5 | 9.73 |
| 1973 | 7.98 | 7.05 | 4.67 | 3.17 | 1.3 | 1.59 | 1.42 | 1.08 | 0.54 | 0.31 | 1.18 | 12 | 3.52 |
| 1974 | 10.5 | 6.83 | 6.23 | 9.49 | 3.03 | 1.44 | 0.45 | 0.25 | 0.45 | 0.23 | 0.19 | 1.98 | 3.42 |
| 1975 | 0.71 | 0.25 | 0.91 | 1.23 | 0.79 | 0.11 | 0.03 | 0.11 | 0.31 | 0.17 | 0.93 | 0.68 | 0.52 |
| 1976 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1977 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1978 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1979 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1980 | 6 | 4 | 4 | 3 | 3 | 2 | 1 | 0.12 | 0.03 | 3 | 11 | 12 | 4.1 |
| 1981 | 7 | 5 | 1 | 2 | 2 | 1 | 1 | 1 | 2 | 9 | 9 | 6 | 3.83 |
| 1982 | 3 | 1.4 | 0.34 | 0.82 | 1.2 | 0.14 | 0 | 1.4 | 0 | 3 | 8 | 10 | 2.44 |
| 1983 | 4 | 2 | 0.51 | 0.04 | 0.85 | 0.05 | 1.4 | 0.09 | 0.01 | 0.5 | 0.93 | 34 | 3.7 |
| 1984 | 117 | 198 | 205 | 47 | 14 | 5 | 6 | 4 | 4 | 4 | 13 | 8 | 52.08 |
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| Avg | 15.98 | 17.95 | 15.92 | 6.09 | 4.54 | 2.02 | 1.61 | 1.42 | 1.19 | 6.49 | 17.96 | 37.7 | 10.74 |
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| Std Dev | 26.95 |
46.66 |
48.86 |
10.83 |
4.32 |
1.64 |
1.54 |
1.25 |
1.36 |
7.11 |
39.41 |
55.33 |
12.49 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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