The pipe drainage runoff and the flow in a ditch within the “Szewce” object situated in Lower Silesia and the physicochemical composition of water in that object were investigated in the years 1977–1980, when the object was irrigated using municipal sewage, and during 1999–2002, i.e. eight years after the irrigation was ceased. The results show that irrigation with municipal sewage did not cause permanent changes in the soil-water environment. When the irrigation was stopped, the pipe drainage runoff and the flow in the ditch markedly decreased. There was also a decrease in the values of BOD₅ and the concentrations of phosphorus and ammonium nitrogen in the tested waters, and an increase in the concentrations of nitrate nitrogen and total nitrogen. The results obtained in 1999–2002 do not differ from the results achieved in other objects under a traditional agricultural land-use system.

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