Table 6 Ranges determining the classes of variables and indices used to characterize hydrometeorological hazards and vulnerability.

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