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[PP13] Hydrological droughts of groundwater
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Key message
Bad

Frequency of groundwater drought is increasing in recent decades in alluvial aquifers. 8 out of 10 years with highest intensity of groundwater drought in period 1981-2024 occurred after year 2000. Groundwater droughts with higher intensity is characteristic for winter while milder groundwater droughts mostly occur at autumn. Groundwater drought intensity is also increasing seasonally with time between June and September when groundwater use is pronounced.

Charts

Figure PP13-1: Annual average of standardized groundwater level index (SGI) on selected measuring stations
Sources:

Hydrologic database ARSO, Slovenian Environment Agency (February, 2025)

Table PP13-2: Percentage of measuring stations with groundwater drought detection in intergranular aquifers by individual years
Sources:

Hydrologic database ARSO, Slovenian Environment Agency (February, 2025)

Show data
Extremely dry (SGI <-2)[%] Severely dry (-2 <SGI <-1.5)[%] Moderately dry (-1.5 <SGI <-1)[%] Mildly dry ( (-1 < SGI < 0)[%]
1981 1.06 4.26 8.51 24.47
1982 1.96 2.94 6.86 25.49
1983 5.83 8.33 16.67 22.50
1984 0 3.92 9.80 23.53
1985 1.59 4.76 11.90 20.63
1986 0 1.63 8.94 20.33
1987 0.92 0.92 10.09 21.10
1988 1.05 2.11 10.53 26.32
1989 2.44 8.94 17.07 21.95
1990 0.93 3.70 14.81 28.70
1991 0.91 1.82 2.73 22.73
1992 0 2.75 19.27 27.52
1993 2.31 15.38 23.08 23.85
1994 0 1.06 5.32 27.66
1995 0.81 1.61 6.45 21.77
1996 0 1.04 1.04 11.46
1997 1.05 7.37 20 32.63
1998 0 3.42 14.38 21.23
1999 0 1.72 7.76 18.97
2000 0 4.17 22.92 31.25
2001 1.69 11.02 15.25 26.27
2002 6.48 20.37 21.30 23.15
2003 8.33 24.07 26.85 25.93
2004 4.27 8.55 11.11 24.79
2005 0 1.59 12.70 24.60
2006 3.03 6.06 15.91 21.97
2007 3.85 7.69 23.08 29.81
2008 0 1.05 10.53 32.63
2009 0.81 1.63 9.76 21.14
2010 0 0 6.67 22.86
2011 1.60 10.40 22.40 24.80
2012 4.88 18.70 23.58 23.58
2013 0 2.11 7.04 19.01
2014 0 0 0 15.56
2015 0 3.19 12.77 29.79
2016 0 3.06 14.29 30.61
2017 0.91 8.18 20 28.18
2018 0.78 2.33 9.30 22.48
2019 1.87 8.41 20.56 28.97
2020 1.77 9.73 20.35 27.43
2021 0 5.26 15.79 27.19
2022 7.77 16.50 24.27 26.21
2023 0 0 2.21 16.91
2024 0.97 0.97 6.80 25.24
Figure PP13-3: Percentage of measuring stations with groundwater drought detection in intergranular aquifers between June and September by individual years
Sources:

Source ()

Show data
Extremely dry (SGI <-2)[%] Severely dry (-2 <SGI <-1.5)[%] Moderately dry (-1.5 <SGI <-1)[%] Mildly dry ( (-1 < SGI < 0)[%]
1981 2.08 2.08 4.17 22.92
1982 0 0 5.56 40.74
1983 0 5.88 17.65 43.14
1984 0 1.75 1.75 24.56
1985 0 1.27 5.06 22.78
1986 0 1.33 0 18.67
1987 0 0 4.69 18.75
1988 0 0 3.64 27.27
1989 0 0 0 20.90
1990 0 0 5.08 42.37
1991 0 0 2.70 21.62
1992 0 3.13 25 45.31
1993 5.26 28.07 40.35 22.81
1994 0 0 3.64 38.18
1995 0 0 0 14.29
1996 0 0 0 7.94
1997 0 1.96 3.92 52.94
1998 0 3.95 18.42 34.21
1999 0 0 0 13.16
2000 0 6.67 35.56 53.33
2001 0 0 8.93 46.43
2002 0 9.23 18.46 32.31
2003 9.43 37.74 39.62 9.43
2004 0 0 2.99 37.31
2005 0 0 1.12 30.34
2006 0 1.54 1.54 24.62
2007 3.51 7.02 29.82 42.11
2008 0 0 3.08 23.08
2009 0 1.32 1.32 18.42
2010 0 0 10.77 30.77
2011 0 0 13.33 62.22
2012 0 20 32.73 32.73
2013 0 3.90 6.49 27.27
2014 0 0 0 18.18
2015 0 0 8.33 41.67
2016 0 0 3.70 44.44
2017 1.47 7.35 25 41.18
2018 0 0 1.39 22.22
2019 0 1.54 9.23 36.92
2020 1.56 9.38 14.06 34.38
2021 0 0 7.14 42.86
2022 13.33 15 26.67 33.33
2023 0 0 0 7.14
2024 0 0 1.69 13.56

Related indicators

Last modified
17.02.2025
Author(s)

Urška Pavlič, Slovenian Environment Agency