The thesis discusses the issues in handling excess excavated material in the region of Slovenian Istria. The reason for the studied subject was the planning of the trunk road Koper - Dragonja, for which a study of excavated material handling was conducted. In this study, the main obstacle in defining suitable locations for disposal sites of excess excavated material turned out to be encroachment on water and waterside land as well as erosion and landslide areas, which are governed by the Waters Act (ZV-1, 2002). In fact, one or more water land areas – predominantly or torrential nature – were located on almost all potential locations for natural material disposal sites. In the thesis, we discuss the issue of excavated material disposal site management and planning on water and waterside land as well as erosion and landslide areas. Initially, we presented the issue of handling excess excavated material, analysed the slope processes in Slovenian Istria and the statutory requirements related to managing and planning excavated material disposal sites. We performed and analysed the interviews with selected representatives of the expert public, analysed and compared three related interventions of managing and planning excavated material disposal sites, and we also conducted a spatial and technical analysis of the excavated material disposal site test example in the region of Slovenian Istria in four design variations. With the help of asked hypothesis and testing of those we have shown that the induction of excavated material disposal sites on water and waterside land as well as erosion and landslide areas should be based on analytical planning approach. Regulations should determine clear procedures and necessary permissions, which would at respecting the protection regimes, however, allow reflection on alternatives to landfill regulation of excavated materials in such areas.