EN
This paper shows velocity of water erosion incidentally meet in young glacial areas occurred after intensive summer rainfall at Daleszewo – North part of Poland. Simple calculation give the amount of 305 tones of soil material, which was washed out from surface of 9 ha. It gives average rainwash on level 35 Mg·ha–1. Locally, at rilling zone, this index reached the value even above 250 Mg·ha–1. Main reason of such heavy water erosion was coincidence of some factors, the most important were probably agrotechnical and atmospherical and relief ones.