| Sub-basin | P | AET | Ro | W | R (mm) | Area (km2) | Total (Mm3) |
| Upper Awash basin | 1112 | 746 | 274 | 9.4 | 82.6 | 6760 | 558 |
| Groundwater outflow from Mugher and Jema sub-basins equal to inflow to the Upper Awash basin | 327 | ||||||
| Upper Awash groundwater basin | 885 | ||||||