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The cross-border river of power: the Drava River in Slovenia

The Drava is the most important river in Slovenia in terms of its energy value. It connects several countries and large bio-geographical regions with its specific water flow, suitable for intensive use and with a living environment worth maintaining.

Drava River

Length in Slovenia: 133 km
Widest point in Slovenia (Vuhred Power Plant reservoir): 350 m
Deepest point in Slovenia (reservoirs of the Ožbalt and Vuhred Power Plants): 23 m
Average annual rate of water flow: 297 m3/s
100-year flow: 2860 m3/s
Head in Slovenia: 148,3 m

 

Izvir Drave

Drava River source near in Italy

The source of the Drava River lies near the Austrian-Italian border in Italy. It ends its course through Austria near Dravograd. After a 133 km journey and a 148 m head, it leaves Slovenia at Ormož, concluding its journey at Osijek in Croatia, where it flows into the Danube River. Along its path, the river connects Alpine and Pannonian bio-geographical regions.

The Drava is a typical fluvio-glacial river, which means that its highest flow is in July during the melting of glaciers, when the majority of other rivers are already showing signs of summer drought. Its other high point is attained in November, when it is filled by autumn rainfall from the wide Alpine hinterland. The precipitation area of the Drava River in Italy and Austria covers 10.964 km2 and in Slovenia another 2700 km2. The central Alps region gives the Drava River some specific characteristics. Inflows from the southern part of the river basin due to the strong influence of the Mediterranean climate cause short-term flow surges in summer, particularly in August, for on average the water flow can reach more than 2800 m3/s once every 100 years, the average annual water flow being only 297 m3/s. In November 2012, the water flows reached values of over 3100 m3/s.

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