The research was conducted with the aim of determining the current state and functionality of the existing surface and underground amelioraiton system in the Lupoglav agro-ecosystem. In this research, the non-functionality of the existing underground system (pipe drainage) and part of the opean surface drainage system with melioration channels was determined. The main causes of the non-functioning of the drainage system at the examined reserch area are, among other that during the construction of the underground drainage system, filter material was not installed on the certain sections, irregular maintenance of the surface drainage systems (dradging and mowing of amelioration canal network), unsatisfactory flooding on a large part of the surface, and failure to carry out additional agrotechnical a measure of undermining. The level of related issue with the duration and intensity of waterlogging by surface and underground water is only partially reduced compared to the state before construction of the drainage system in the subject area (36 years ago), and therefore it is recommended to build a new underground drainage system in the subject area along with the complete revitalization of the canal network.