| Water table levels (m) Topo to Raster | Areas (% of total) | ||
| Alluvial deposits | Marine sediments | Barreiras group | |
| −9.4 to −5 | 0 | 0 | 0 |
| −4.9 to −2 | 0 | 0.2 | 0 |
| −1.9 to 0 | 0.1 | 15 | 0.1 |
| 0.1 to 2 | 20 | 44.2 | 1.9 |
| 2.1 to 5 | 51.5 | 40.8 | 12.5 |
| 5.1 to 10 | 17 | 0 | 21.6 |
| 10.1 to 20 | 11.1 | 0 | 36 |
| 20.1 to 43.7 | 0.3 | 0 | 27.9 |