Table 3 Probability of drought events in the Northern part/Bilate catchment of Abaya Chamo sub basin.

From: Integrated assessment of meteorological, hydrological and agricultural drought in Abaya Chamo sub Basin, Ethiopia

Accumulation period

Mild drought

Moderate drought

Severe drought

Extreme drought

N

Probability

N

Probability

N

Probability

N

Probability

SPEI-1

163

1 in 3.2 yrs.

60

1 in 7 yrs.

21

1 in 21 yrs.

8

1 in 40 yrs.

SPEI-3

166

1 in 3.2 yrs.

42

1 in 14 yrs.

31

1 in 14 yrs.

9

1 in 41 yrs.

SPEI-6

161

1 in 3.2 yrs.

53

1 in 7 yrs.

40

1 in 14 yrs.

6

1 in 41 yrs.

SPEI-12

159

1 in 3.2 yrs.

44

1 in 14 yrs.

41

1 in 14 yrs.

5

1 in 41 yrs.

  1. N represents number of months observed with respective droughts severity classes.
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