1 Faculty of Civil, Geo and Environmental Engineering, Technical University of Munich, Arcisstr. 21, 80333 Munich, Germany; Institute of Geography, University of Innsbruck, Innrain 52f, 6020 Innsbruck, Austria. Electronic address: Gabriele.chiogna@tum.de.
2 Faculty of Civil, Geo and Environmental Engineering, Technical University of Munich, Arcisstr. 21, 80333 Munich, Germany.
3 Department of Geography, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
4 Institute of Groundwater Ecology, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany; Institiute of Hydraulics and Rural Water Management, University of Natural Resources and Life Sciences Vienna, Muthgasse 18, 1190 Wien, Austria.