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A. H. Support and T. O. , was provided by the Emmy Noether Programme of the German Research Foundation (DFG; grant no. HA 8113/1-1; project "Global Assessment of Water Stress in Karst Regions in a Changing World"). V.M. was supported by the Innovation Fund of Freiburg University and RiSC of the Ministry for Science, Research and Art of Baden-Wuerttemberg. The authors appreciate Simon Brenner, Laura Vecera, Robin Schwemmle, Mirjam Scheller and Justine Berg for helping with hydrographs digitisation. The authors also appreciate the contributions Laurent Danneville of Parc Naturel

W. Santini and P. Fraisy, GC was supported by NERC MaRIUS: Managing the Risks, Impacts and Uncertainties of droughts and water Scarcity, grant number NE/L010399/1. DB and GC refer to the UNMIX project, which is supported by the Deutsche Forschungsgemeinschaft (DFG) through the TUM International Graduate School for Science and Engineering (IGSSE), GSC 81. Gabriele Chiogna acknowledges the support of the Stiftungsfonds für Umweltökonomie und Nachhaltigkeit GmbH (SUN). The Spanish team were supported by CGL2015-665858 project of Spanish Ministry of Science and Research Group RNM-308 of Junta de Andalucía. Part of the French data were monitored within the framework of the KARST observatory network (www.sokarst.org) initiative from the INSU/CNRS, which aims to strengthen knowledge-sharing and promote cross-disciplinary research on karst systems. The data collection was kindly supported by the Karst Commission of the International Association of Hydrogeologists, Peru, which was funded by LMI IRD Paleotraces, SO HYBAM and FONDECYT/CONCYTEC (grant contract 226-2015-FONDECYT)

T. , wrote the automatic download routine codes and S.S. tested the compatibility of the code for various computer operating systems. T.O. developed the database structure and data processing methods supervised by A.H. All other co-authors, managed the collection and processing of datasets for WoKaS database since 2018. V.M. conducted the collection of the datasets between 2015 and 2017. T.O. wrote the first draft of the manuscript

M. Franklin, . College, . Lancaster, U. Pennsylvania, U. Isto et al., Institute of Applied Geosciences, Karlsruhe Institute of Technology (KIT), Maestria en Recursos Hídricos, Lima, Perú. 9 Parc Naturel Régional des Grands Causses (PRNGC), vol.21

, 35 Géosciences Environnement Toulouse (GET) -CNRS -UPS -IRD -CNES, 14 avenue Edouard Belin, 31400, p.42

W. Groundwater and C. Ontario,