Key message
Bad

Frequency and intensity of groundwater droughts is increasing in recent decades. 7 out of 10 years with highest annual intensity of phenomenon is classified in the period after year 2000. The highest intensity of groundwater drought was recorded in years 2012, 2002 and 2003. Regarding the duration of groundwater drought the period between years 2002 and 2004 stands out. Extreme groundwater drought most frequently occur in winter and spring while severe drought is most commonly observed in spring and summer.


Charts

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

Source: Hydrologic database ARSO, Slovenian Environment Agency (February, 2022)

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

Source: Hydrologic database ARSO, Slovenian Environment Agency (February 2022)

Show data
Extremely dry (SGI <-2)[%] Severely dry (-2 <SGI <-1.5)[%] Moderately dry (-1.5 <SGI <-1)[%] Moderate wet (1 < SGI > 1.5)[%] Severely wet (1.5 < SGI > 2)[%] Extremely wet (SGI > 2)[%]
2000 0 -12.90 -83.87 22.58 3.23 0
2001 0 0 -41.94 48.39 25.81 25.81
2002 -38.71 -70.97 -96.77 16.13 9.68 3.23
2003 -35.48 -87.10 -80.65 12.90 0 0
2004 -16.13 -38.71 -54.84 51.61 25.81 0
2005 -3.23 -12.90 -77.42 67.74 38.71 29.03
2006 0 -3.23 -32.26 61.29 45.16 12.90
2007 -25.81 -41.94 -77.42 25.81 6.45 3.23
2008 0 -6.45 -51.61 29.03 16.13 6.45
2009 -3.23 -9.68 -41.94 83.87 58.06 38.71
2010 0 -12.90 -38.71 64.52 38.71 19.35
2011 0 -22.58 -67.74 74.19 35.48 12.90
2012 -41.94 -74.19 -96.77 6.45 0 0
2013 -3.23 -16.13 -41.94 90.32 70.97 51.61
2014 0 0 -12.90 80.65 64.52 96.77
2015 0 -3.23 -32.26 67.74 48.39 32.26
2016 -3.23 -22.58 -54.84 51.61 32.26 12.90
2017 -12.90 -41.94 -90.32 6.45 6.45 3.23
2018 0 -9.68 -29.03 93.55 51.61 22.58
2019 -22.58 -41.94 -70.97 35.48 6.45 0
2020 -25.81 -54.84 -83.87 51.61 22.58 25.81
2021 -6.45 -25.81 -54.84 58.06 19.35 6.45
Figure PP13-3: Deviation of the annual amount of vertical groundwater supply with precipitation infiltration from the reference period
Sources:

Hydrologic database ARSO, Slovenian Environment Agency (May 2021)

Show data
Periodic average of mGROWA 1991-2020 (in mm) [mm] Deviation from average (mm) [mm] Deviation from the average (%) [%]
2000 316.55 -94.67 -29.91
2001 316.55 137.39 43.40
2002 316.55 -86.46 -27.31
2003 316.55 -130.62 -41.26
2004 316.55 61.77 19.51
2005 316.55 -20.87 -6.59
2006 316.55 -26.93 -8.51
2007 316.55 -65.02 -20.54
2008 316.55 -80.43 -25.41
2009 316.55 52.58 16.61
2010 316.55 98.14 31.00
2011 316.55 -40.39 -12.76
2012 316.55 -126.58 -39.99
2013 316.55 106.89 33.77
2014 316.55 186.10 58.79
2015 316.55 5.32 1.68
2016 316.55 -49.27 -15.56
2017 316.55 -32.16 -10.16
2018 316.55 36.38 11.49
2019 316.55 -77.53 -24.49
2020 316.55 46.21 14.60

Methodology

Date of data source summarization

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