The Hydroecological Information System (HEIS VÚV) is the central information system of TGM WRI, p. r. i., in the field of water management and water protection and an information resource for the institute's researchers and users from the public administration and professional and lay public. The HEIS VÚV provides tools for data acquisition, storage, processing, analysis and publication. The core of the system is a geodatabase (Digital Water Management Data Base - DIBAVOD) including a wide range of data (hydrography, hydrology, water resources, protected areas in relation to water, quantity and quality of surface and groundwater, water use, etc.), which provides the basis for their more detailed evaluation (water balance, modelling of water quantity and quality, etc.). The HEIS VUV uses mainly relational database tools (RDBMS Oracle) and GIS tools. The HEIS VUV is publicly accessible through online data services based on the Open GIS Consortium (OGC) standards.