Geological unit

Lithology

Resistance index

Area (% of total)

Drainage length

Drainage Density (Km/Km²)

Rating value

Coefficient value

Risk

E^va

Andesitic lava, Tuff

3

3.67

12.49

4.34

10

30

High

E^a

Andesite, Andesitic basalt

2

0.33

0.45

1.76

8

16

Moderate

O_r

Rhyolite

1

0.68

1.45

2.72

10

10

Slight

gr

Granite

4

14.26

49.6

4.44

10

40

Severe

Qpl^c

Unconsolidated Conglomerate

6

4.71

19.77

5.37

10

60

Very Severe

Qpl^m

Sandy marl

9

27.57

118.5

5.49

10

90

Very Severe

Q^t2

Young terraces

8

46.46

11

3.04

10

80

Very Severe

Q^al

Alluvium

7

2.32

25.1

13.85

10

70

Very Severe