The graduation thesis describes the reconstruction of functioning of the water supply system in Ferrari’s garden in Štanjel. The first part of thesis deals with methods and devices for detecting waterwork elements and losses on water supply systems. Further on are described different modes of functioning of devices and methods, interpretation of results and how was each method used at the water supply system reconstruction. The second part describes the course of reconstruction in fieldwork. The last comprised of inspection of all cisterns included in Ferrari’s water supply system. Then it followed the assessment of functions, location of separate parts of the system and the condition assessment of the waterworks system. Places of leakages, injuries and missing parts of the system were detected. Furthermore, water supply sistem was drawn into digital cadastral register, which is enclosed in annex. Also a motion was proposed for the condition improvemt of the Fabiani’s water system.