The paper presents the results of 8-year investigations (1995–2002) carried out in two different objects – Samotwór and Miękinia near Wrocław. The investigations included analyses of the quality of ground and surface water, both for inflow and outflow. It was found that in the conditions of Polish agriculture, outflow control belongs to the most helpful ways of managing water resources. The final effects of outflow control depend mainly on hydrogeological conditions and exact respectation of the dates and heights of water damming with regard to hydrological events and agricultural land-use system.

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