| Saprolite resistivity (Ωm) | Aquifer characteristics |
| <750 | High fractured permeability as a result of weathering; high aquifer potential. |
| 750 - 1500 | Reduced influence of weathering; medium aquifer potential. |
| 1501 - 3000 | Fairly low effect of weathering; low aquifer potential. |
| >3000 | Little or no weathering of the bedrock; negligible aquifer potential. |