| 降水阈值(mm) | 采样前样本数 | 采样后样本数 | 
| 无降水 | 1,292,440 | 339,646 | 
| 0.1 | 372,259 | 275,024 | 
| 1 | 210,402 | 210,402 | 
| 5 | 80,289 | 80,289 | 
| 10 | 36,165 | 36,165 | 
| 15 | 17,153 | 17,153 | 
| 20 | 9650 | 9650 | 
| 30 | 4035 | 4035 | 
| 40 | 1881 | 1881 | 
| 50 | 957 | 957 | 
| 60 | 533 | 533 | 
| 70 | 311 | 311 | 
| 80 | 170 | 170 | 
| 90 | 89 | 89 | 
| 100 | 37 | 37 |