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Our paper presents the results of heavy metal (HM) (Zn, Cu, Pb, Cd) content in bottom sedimentsfrom retention tanks along Oliwa Stream in Gdansk, Poland, before a flood (BF) and after a flood (AF)14-15 July 2016. The flood had a huge impact on the quality of bottom sediments and theirdisplacement. The concentrations of HM differed significantly for research series conducted 3 monthsBF and 8 months AF. The concentration of Cu increased from 3.5 mg/kg to 88.8 mg/kg BF andfrom 12.1 mg/kg to 1,114.3 mg/kg AF, Zn from 27.4 mg/kg to 129.9 mg/kg BF; and 42.3 mg/kg to244.8 mg/kg AF, Cd from 0.04 mg/kg to 0.47 mg/kg BF, and 0.08 mg/kg to 0.47 mg/kg AF. Also,the migration of some metals, mostly Cu to retention tanks located downstream, was observed, resultingfrom the washing away of sediments in the upper part of the stream. Since the stream inflows to the Gulfof Gdansk, urban flooding created a risk of migration of contaminants to the Baltic Sea.

Change in Heavy Metals Concentrations in Sediments Deposited in Retention Tanks in a Stream after a Flood