| Septic tanks | Su (m2) | Qmaxn (m3/h) | Qmaxn/Su (m/s) |
| S1 | 88 | 7.37 | 0.08 |
| S2 | 73.3 | 7.37 | 0.10 |
| S3 | 58.7 | 7.37 | 0.12 |
| S4 | 48.9 | 7.37 | 0.15 |
| S5 | 44 | 7.37 | 0.17 |