| Sub-System | Indicator | Code |
| Aquifer thickness (A) | Excellent Very High High Moderately High | C1 C2 C3 C4 |
| Aquifer media (M) | Excellent Very High High Moderately High Medium | C5 C6 C7 C8 C9 |
| Aquitard thickness (O) | Excellent Very High High Medium | C10 C11 C12 C13 |