Table 5 Probability of drought events in the Southwestern part/lakes 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

164

1 in 3.2 yrs.

55

1 in 10 yrs.

28

1 in 20 yrs.

5

1 in 41 yrs.

SPEI_3

169

1 in 3.2 yrs.

53

1 in 10 yrs.

38

1 in 20 yrs.

6

1 in 41 yrs.

SPEI_6

159

1 in 3.2 yrs.

53

1 in 10 yrs.

35

1 in 20 yrs.

7

1 in 41 yrs.

SPEI_12

151

1 in 3.2 yrs.

64

1 in 10 yrs.

28

1 in 20 yrs.

5

1 in 41 yrs.

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