Table 6.
Ranges determining the classes of variables and indices used to characterize hydrometeorological hazards and vulnerability.
| VL | L | M | H | VH | |
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |
| Hazard | |||||
| NTD (no. days/year) | ≤ 3 | [3, 5[ | [5.0, 10.0[ | [10.0, 15.0[ | ≥ 15.0 |
| MWG (km/h) | ≤ 50 | [50, 70[ | [70, 90[ | [90, 100[ | ≥ 100 |
| NRDS (no. days/year) | ≤ 10 | [10, 15[ | [15, 20[ | [20, 30[ | ≥ 30 |
| T20 (mm) | ≤ 40 | [40, 100[ | [100, 200[ | [200–300[ | ≥ 300 |
| HHI | < 1.4 | 1.4–2.6 | 2.6–4.0 | 4.0–5.6 | > 5.6 |
| Vulnerability | |||||
| Soil permeability (runoff coefficient) | < 0.36 | [0.36, 0.38[ | [0.38, 0.41[ | [0.41, 0.45[ | ≥ 0.45 |
| Slope (degrees) | ≤ 0.75 | [0.75, 1.5[ | [1.5, 3.0[ | [3.0, 6.0[ | ≥ 6.0 |
| Stream order | ≤ 1.5 | [1.5, 2.5[ | [2.5, 3.5[ | [3.5, 4.5[ | ≥ 4.5 |
| HVI | < 1.15 | 1.15–1.7 | 1.7–2.3 | 2.3–2.9 | > 2.9 |