The Spearman rank correlation coefficient of the water quality class in the inland water system (August 2014–May 2017) Wp0.05 = 0.306
| Index . | Class IV . | Class V . | Worse than class V . |
|---|---|---|---|
| The Spearman rank correlation coefficient (rs) | 0.188 | 0.324* | −0.317* |
| Significant | Not significant | Significant | Significant |
| Trend | Stable | Rise or worse | Fall or improve |
| Index . | Class IV . | Class V . | Worse than class V . |
|---|---|---|---|
| The Spearman rank correlation coefficient (rs) | 0.188 | 0.324* | −0.317* |
| Significant | Not significant | Significant | Significant |
| Trend | Stable | Rise or worse | Fall or improve |