The NICHE-Vlaanderen project had the goal to develop an hydro-ecological prediction model, used in ecological impact assessment studies. The data in this dataset is part of the vegetation-plot data used to feed the model and contains groundwater depending terrestrial vegetation relevées in relation to groundwater levels. Vegetation plot relevés were performed near selected piezometers (WATINA database, groundwater network Flanders) between May and August in 2002, 2004 and 2005. Initially the vegetation surveys were recorded in Turboveg (Hennekens, 1998) and later on moved to INBOVEG, the INBO vegetation plot database. The dataset contains 569 vegetation relevées, recorded during the fieldwork of the NICHE-Vlaanderen project. Relevées contain species coverage data, coverage data for layers, vegetation height and the date of recording. All the vegetation relevées were classified as vegetation types. Issues related to the dataset can by submitted here: https://github.com/inbo/data-publication/tree/master/datasets/inboveg-niche-vlaanderen-events To allow anyone to use this dataset, we have released the data to the public domain under a Creative Commons Zero waiver (http://creativecommons.org/publicdomain/zero/1.0/). We would appreciate however, if you read and follow these norms for data use (http://www.inbo.be/en/norms-for-data-use) and provide a link to the original dataset (https://doi.org/10.15468/gouexm) whenever possible. If you use these data for a scientific paper, please cite the dataset following the applicable citation norms and/or consider us for co-authorship. We are always interested to know how you have used or visualized the data, or to provide more information, so please contact us via the contact information provided in the metadata, opendata@inbo.be or https://twitter.com/LifeWatchINBO.