This paper presents the morphometric changes in a selected piping system in the Tyskowa catchment in the Bieszczady Mts. (Eastern Carpathians) in Poland. The detailed geodesic measurements were made twice a year – in spring and in autumn – in 2013-2014. The Topcon Hiper II (base and rover) with the FC- 250 field controller were used. The high resolution elevation model and additional maps were prepared using ArcGIS 10.2 software with ArcScene for 3D visualization. The positive and negative openness index were calculated in Saga GIS 2.1.4 software. The morphometric changes were calculated using Algebra map in ArcGIS 10.2. The different ways of the piping system visualization allow emphasizing the position of pipes in the slope-valley system. The concavity above the existing gully with the surface traces of pipe collapsing indicate the influence of piping in the gully formation and in its future development. The morphometric changes in the piping system enables to present erosion and accumulation zone within the piping system.