| Station: | Manampitiya | Continent: | Asia | ||
| River: | Mahaweli Ganga | Major Basin : | Indian Ocean | ||
| Country: | Sri Lanka | Discharge into : | Indian Ocean | ||
| Observation Period: | 1965 - 1984 | Total Months: | 239 | ||
| Latitude (dec deg): | 7.91 N | Area (km2): | 7343 | ||
| Longitude (dec deg): | 81.08 E | Elevation (m): | 31 | ||
| Annual Discharge: (m3/s): | 192.3 | (km3/yr): | 6.1 | ||
| Annual Runoff: (l/s/km2): | 26.1 | (mm/yr): | 824.4 |
| Mean for Observation Period | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| m3/sec | 303.1 | 205.2 | 109.3 | 110.2 | 118.0 | 98.8 | 116.8 | 131.7 | 129.2 | 200.8 | 309.9 | 467.9 |
| km3/mo | 0.8 | 0.5 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.4 | 0.3 | 0.5 | 0.8 | 1.3 |
| mm/mo | 110.6 | 67.6 | 39.9 | 38.9 | 43.1 | 34.9 | 42.6 | 48.0 | 45.6 | 73.2 | 109.4 | 170.7 |
| l/s/km2 | 41.3 | 27.9 | 14.9 | 15.0 | 16.1 | 13.5 | 15.9 | 17.9 | 17.6 | 27.3 | 42.2 | 63.7 |
