| Drainage Basin | Area km2 | Land Area km2 | Sustainable Ground Water (mm/yr) |
| Lake Edward | 18,946 | 17,855 | 20.3 |
| Lake Victoria | 61,886 | 32,924 | 24.7 |
| Lake Albert | 18,079 | 14,882 | 23.7 |
| Victoria Nile | 27,961 | 27,807 | 39.9 |
| Lake Kyoga | 57,236 | 53,899 | 36.1 |
| Albert Nile | 20,727 | 20,484 | 24.4 |
| Aswa | 27,637 | 27,635 | 17.3 |
| Kidepo | 3229 | 3228 | 6.3 |
| Miscellaneous | 5716 | 5679 | 15.0 |