Hydrogeology-related research activities cover a wide spectrum of research areas at EU and national levels. The KINDRA project (Knowledge Inventory for hydrogeology
research, Grant Agreement No. 642047) seeks to create a critical mass for scientific knowledge exchange of hydrogeological research, to ensure wide applicability on research results - including support for innovation and development - and to reduce unnecessary duplication of efforts. A new terminology and classification methodology for groundwater R&D results and activities (Hydrogeological Research Classification System: HRC-SYS) has been developed based on a hierarchical structure using keywords derived from EU directives and scientific journals. This classification allows the population of a European Inventory of Groundwater Research (EIGR) of research results, activities, projects, and programmes to be used to identify critical research challenges and gaps, for better implementation of the Water Framework Directive