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Table 6 The significant drought events (SPI/SPEI ≤ − 1) duration, magnitude, intensity, and peak value at the central part of OGRB from 1981 to 2017

From: Spatiotemporal analysis of droughts characteristics and drivers in the Omo-Gibe River basin, Ethiopia

Sub-basin

Stations

Accumulation periods

Duration

Magnitude

Intensity

Peak value

Central

Bele

SPI-4

May 1990–Feb 1991

− 13.35

− 1.34

− 2.39

SPI-12

Jul 2002–Jul 2003

− 23.89

− 1.84

− 2.27

SPEI-4

Jun1990–Jan1992

− 21.39

− 1.1

− 2.16

SPEI-12

Jul 1990–Dec 1991

− 25.81

− 1.36

− 2.32

Bonga

SPI-4

Aug 1996–Sep 1997

− 30.99

− 2.20

− 3.61

SPI-12

Oct 1994–Dec 1995

− 20.20

− 1.35

− 3.37

SPEI-4

Aug 1996–Aug 1997

− 21.59

− 1.66

− 2.28

SPEI-12

Dec 2010–Sep 2013

− 44.32

− 1.30

− 2.36

Jimma

SPI-4

Aug 2003–Aug 2004

− 14.27

− 1.1

− 3.37

SPI-12

Jun 2011–Apr 2013

− 27.28

− 1.19

− 2.41

SPEI-4

Aug 2003–Sep 2004

− 17.36

− 1.24

− 2.29

SPEI-12

Jun 2011–Dec 2013

− 34.16

− 1.10

− 2.27

Shebe

SPI-4

Feb 2002–Dec 2002

− 24.35

− 2.20

− 3.62

SPI-12

Apr1994–Dec 1995

− 29.38

− 1.40

− 3.74

SPEI-4

Oct 1994–Oct 1995

− 20.80

− 1.39

− 2.29

SPEI-12

Jan 1994–Apr 1996

− 45.40

− 2.24

− 2.11

Yayaotona

SPI-4

Feb 2000–Sep 2000

− 10.89

− 1.36

− 2.85

SPI-12

Apr 1999–Feb 2001

− 31.75

− 1.38

− 2.19

SPEI-4

Feb 2000–Sep 2000

− 10.69

− 1.33

− 2.23

SPEI-12

Apr 1999–Feb 2001

− 33.64

− 1.46

− 1.97