| Source | DF | Sum of squares | F Ratio | Prob > F |
| Model† | 8 | 406742.7 | 2478.4 |
|
| Flooding time | 8 | 406742.7 | 2478.4 | <0.0001 |
| Error | 531 | 10893.2 |
|
|
| Total | 539 | 417636.0 |
| <0.0001 |
| Model‡ | 8 | 474223.6 | 3242.1 |
|
| Flooding time | 8 | 474223.6 | 3242.1 | <0.0001 |
| Error | 531 | 9708.7 |
|
|
| Total | 539 | 483932.2 |
| <0.0001 |