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[VD03] River balance
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Key message
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A longer temporal string of comparable data (from 1961 to 2008) indicates the decreasing run-off of river water in Slovenia.

This indicator shows the annual river balance of the Republic of Slovenia as a whole. The balance is composed of the river water inflow and run-off expressed in million m3/year. Both elements are calculated on the basis of mean annual discharge (flow, Qs) of the water measuring stations catching the majority of inflow and run-off of river water in and from Slovenia. The balance of the river flow rates in Slovenia represents one of the fundamental and more dynamic elements of the Slovenian water balance which is also composed of precipitation, evaporation, changes in groundwater reserves and water use. Discharge measurements are reliable and have a certain tradition, so that a longer temporal frame of comparable data is available for them. Upon accurate assessment of immediate anthropogenic effects on the river regime, the river balance may serve as a good indicator for the assessment of (potential) effects of climate changes on the quantities of available water.

Charts

Figure VD03-1: Net run-off as a difference between total run-off and inflow
Sources:

Hidrolog - Hydrology Database, Environmental Agency of the Republic of Slovenia, 2010; (* Data changed, more in Methodology chapter).

Show data
1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
inflow million m3/year 12453 15163 14629 11969 20300 16564 14929 12715 12858 15595
total run-off million m3/year 28699 35475 33294 29531 45265 33854 29115 28472 31449 33382
net run-off million m3/year 16246 20312 18665 17562 24965 17290 14186 15757 18591 17787
1971* 1972 1973 1974 1975 1976 1977 1978 1979 1980
inflow million m3/year 9408 16409 12512 12081 16325 11028 13551 12898 16075 14103
total run-off million m3/year 22074 36552 26541 28743 32543 26566 29571 29262 35669 32300
net run-off million m3/year 12666 20143 14029 16662 16218 15538 16020 16364 19594 18197
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
inflow million m3/year 12652 13152 11069 11965 12754 13098 14189 12499 13414 11602
total run-off million m3/year 26077 29880 22087 28633 28763 28177 31944 26871 26557 26188
net run-off million m3/year 13425 16728 11018 16668 16009 15079 17755 14372 13143 14586
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
inflow million m3/year 14611 13736 12566 12033 11746 14737 11706 12344 13873 14299
total run-off million m3/year 30235 28802 25296 25725 28176 32994 24027 28092 29659 30263
net run-off million m3/year 15624 15066 12730 13692 16430 18257 12321 15748 15786 15964
2001 2002 2003 2004 2005 2006 2007 2008
inflow million m3/year 11586 11458 9253 13087 12938 11821 10550 11639
total run-off million m3/year 26912 24785 18353 30492 26837 24967 22213 28043
net run-off million m3/year 15326 13327 9100 17405 13899 13146 11663 16404

Goals

- Good water status by the year 2015.

- Improved assessments of water quantities.

- Providing sufficient amount of drinking water for inhabitants.

- Better availability of water intended for use (in the sense of reducing the effects of hydrological droughts) and improved state of water and water ecosystems.

Last modified
09.10.2010
Author(s)

Marjan Bat, Agencija RS za okolje