| Gravel percentage of soil (Ps) | Drained soil (Dr) | Ecological factors, many classes | ||
| value | Great | value | Great | |
| 2 | 2% - 15% | 0 | perfect | 1 |
| 4 | 16% - 50% | 13 | Good of average | 2 |
| 7 | 51% - 90% | 0 | Incomplete average | 3 |
| 0 | More than 90% | 0 | Poor incomplete | 4 |
|
|
| 0 | Poor | 5 |