Table 9 The probability of drought events in the Southern part 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

148

1 in 3.2 yrs.

55

1 in 7 yrs.

17

1 in 14 yrs.

7

1 in 41 yrs.

SPEI-3

148

1 in 3.2 yrs.

50

1 in 10 yrs.

27

1 in 14 yrs.

4

1 in 41 yrs.

SPEI-6

154

1 in 3.2 yrs.

52

1 in 7 yrs.

22

1 in 14 yrs.

6

1 in 41 yrs.

SPEI-12

159

1 in 3.2 yrs.

45

1 in 10 yrs.

31

1 in 13 yrs.

5

1 in 41 yrs.

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