| 影响因素 | 风险权重 | 分级 | 风险分值 |
| 积水深度(cm) | 0.4 | h < 15 | 1.5 |
| 15 ≤ h < 30 | 2 | ||
| 30 ≤ h < 50 | 2.5 | ||
| h ≥ 50 | 3 | ||
| 积水历时(h) | 0.4 | t < 1 | 1 |
| 1 ≤ t < 2 | 2 | ||
| t ≥ 2 | 3 |