Table 7 The significant drought events (SPI/SPEI ≤ − 1) duration, magnitude, intensity, and peak value in the south part of OGRB from 1981 to 2017
Sub-basin | Stations | Accumulation periods | Duration | Magnitude | Intensity | Peak value |
|---|---|---|---|---|---|---|
Southern | Jinka | SPI-4 | Nov 1996–Sep 1997 | − 24.3 | − 2.27 | − 4.89 |
SPI-12 | Jun 1999–Sep 2000 | − 32.78 | − 2.05 | − 3.22 | ||
SPEI-4 | Sep 1993–Apr 1994 | − 12.18 | − 1.52 | − 2.25 | ||
SPEI-12 | Jun 1999–Dec 2000 | − 39.94 | − 2.10 | − 2.36 | ||
Morka | SPI-4 | Mar 2009–Sep 2009 | − 13.37 | − 1.91 | − 3.02 | |
SPI-12 | Aug 2011–Mar 2012 | − 25.93 | − 2.16 | − 2.25 | ||
SPEI-4 | Apr 1999–Apr 2000 | − 17.65 | − 1.36 | − 2.32 | ||
SPEI-12 | Mar 1988–Apr 1991 | − 59.54 | − 1.57 | − 2.16 | ||
Sawla | SPI-4 | Oct 2010–Jun 2012 | − 29.51 | − 1.41 | − 3.54 | |
SPI-12 | May 2007–Feb 2010 | − 80.85 | − 1.53 | − 2.76 | ||
SPEI-4 | Oct 2010–Jun 2012 | − 31.02 | − 1.48 | − 2.38 | ||
SPEI-12 | Apr 2011–Jan 2017 | − 86.83 | − 1.21 | − 1.98 |