Monitoring of surface water regime on the territory of Serbia; analysis and processing elements of the water balance; processing and control of hydrological parameters; keeping records and hydrological database of surface and ground water; preparation and issuance of hydrological data; preparation of hydrological analysis, surveys and studies; production of hydrological basis for individual basins and the whole territory of Serbia and display information in the form of generalized maps, regional dependence and the like; study of the spatial and temporal distribution of hydrological variables with the aim of studying water resources; production, maintenance and updating of cadastre physical-geographical and hydrological characteristics of catchments; issuing expert opinions; issuing meteorological conditions.