The hydropower plant “Donja Dubrava” is the last one of a chain of 22 hydropower dams on the Drava River in Austria, Slovenia and Croatia. Five dams on the Drava are found downstream of Maribor in Maribor, Ptuj, Ormož, Varaždin and Dubrava. This last dam at Donja Dubrava was finalised by former Yugoslavia in 1989, a few kilometres above the confluence of the Mura into the Drava River close to the border to Hungary. The natural river course and its braided section have been completely changed into a series of five barrages and abstraction channels. Today the free flowing river stretch of the Drava downstream of the last dam at Donja Dubrava is suffering severe river bed erosion due to a much reduced load of sediments and thus Riverbed deepening. The peak energy mode of the hydropower plant leads to changes of the water level on the Lower Drava between 0,6 and 1,8 m – sometimes several a day. The daily water oscillation by hydro peaking is evident more than 200 km downstream (Barcs up to 80 cm, few cm in Osijek close to the Drava-Danube confluence).