Grading | Total stations | Percentage (%) | Average stations |
≥20 (mm/h) | 3492 | 100 | 97 |
20 - 30 (mm/h) | 2525 | 72.31 | 70.14 |
30 - 40 (mm/h) | 672 | 19.24 | 18.67 |
40 - 50 (mm/h) | 193 | 5.53 | 5.36 |
≥50 (mm/h) | 102 | 2.92 | 2.83 |