| Description | Base flow regimes (% of original average flow in period) | |
|---|---|---|
| October-March | April-September | |
| Flushing or maximum | 200 | 200 |
| Optimum range | 60–100 | 60–100 |
| Outstanding | 40 | 60 |
| Excellent | 30 | 50 |
| Good | 20 | 40 |
| Fair or degrading | 10 | 30 |
| Poor or minimum | 10 | 10 |
| Severe degradation | 10–0 | 10–0 |
