Na području grada Osijeka, kao i okolici, poplave se bilježe već od 18. st. Od tada je pretvoren dio okolnog močvarnog područja u naselja i poljoprivredna područja, skraćen je tok rijeke Drave, a smanjeno je i inundacijsko područje. Blizina ušća Drave u Dunav pokazala se izuzetno važnom zbog utjecaja uspora. Provedene hidrološke analize od 1926. do 2014. god. pokazale su da na maksimalne vodostaje Drave kod Osijeka veći utjecaj ima protok Dunava nego Drave, a najveći je zajednički utjecaj protoka obiju rijeka. Izračunate su RAPS vrijednosti maksimalnih mjesečnih i godišnjih protoka. Rezultati pokazuju da protoci rijeke Drave opadaju od kraja 1976. god., dok vode Dunava bilježe porast od 1995. god..; Floods in the City of Osijek area and its surroundings have been recorded since the 18th century. From that time period, a part of the surrounding wetland area has been transformed into settlements and agricultural surfaces whereas the Drava course has been shortened and its inundation surfaces reduced. The vicinity of the Drava and Danube confluence proved to be of utmost importance due to the backwater impact. Hydrological analyses performed from 1926 to 2014 showed that maximum Drava water levels at Osijek are under a stronger influence by the Danube than by the Drava, while the joint influence of both river flows exert the strongest influence. The RAPS values of the maximum monthly and annual discharges were calculated, and the results show that the Drava discharges have decreased since the end of 1976, while the Danube records increases since 1995.