Regions

Yearly amount of rainfall (mm)

Yearly amount of run-off (mm)

Area (%)

Yearly amount of

water resources (%)

Arid

<200

<10

26.6

2

Semi-arid

200 - 400

10 - 50

20.9

5

Total

47.5

7

Humid

400 - 800

50 - 200

18.6

12

Semi-humid

800 - 1600

200 - 800

26.0

58

Extremely humid

>2000

>800

7.9

23

Total

52.5

93