The analysis of slope stability of slope Piekarówka localized in Pławna near Cieżkowice is presented in the paper. In the slope in June of 2010 as a consequence of intensive rainfall was induced mud flow which was stopped on buildings located below the landslide. In the frame of investigation were done in-situ, laboratory tests and were done integrated infiltration and slope stability calculations. Field and laboratory tests revealed that the landslide movement was limited to superficial layer of slope, which was built of cohesive soils of low permeability. Infiltration calculations made using MontrasioValentino and Green-Ampt models gave varied due to quality as well as quantity, results of progress of infiltration process. In considered case more negative calculation results were determined using Montrasio-Valentino model. Stability analysis revealed that a necessary condition for the initiation of instability process was saturation of superficial slope layer and increase of seepage forces.

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