Table 7 The probability of drought events in the Eastern part/Gidabo 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

147

1 in 3.2 yrs.

61

1 in 7 yrs.

18

1 in 20 yrs.

5

1 in 41 yrs.

SPEI-3

164

1 in 3.2 yrs.

39

1 in 10 yrs.

34

1 in 13 yrs.

4

1 in 41 yrs.

SPEI-6

163

1 in 3.2 yrs.

36

1 in 10 yrs.

35

1 in 13 yrs.

4

1 in 41 yrs.

SPEI-12

159

1 in 3.2 yrs.

39

1 in 10 yrs.

40

1 in 10 yrs.

3

1 in 41 yrs.

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