The theme of the thesis is the use of terrestrial laser scanning and processing scanned data to determine the movement of the overflow wall. The thesis first describe the theoretical part of the collecting and processing data from laser scanning. Practical part of the thesis consisted of scanning the overflow wall Melje small hydroelectric power plant (SHP Melje) with terrestrial laser scanner Leica Nova MS 50 MultiStation. The scanned data was processed with the software package Pointsense, which is built into AutoCad. The result of the processing is wireframe or 3D model of the overflow wall. We continue to count horizontal and vertical accuracy of detailed points of the planes that serve as an aid for making wireframe.