**6. Acknowledgements**

We are indebted to the German Science Foundation (DFG) for research grants. Many thanks to Miroslav Šobr, Michal Jenicek, Martin Vacha and Milada Matouskova (Charles University of Prague) and Mascha Albrecht, Robert Wagner, Simone Anjelski, Monika Sennekamp (Freie Universität Berlin) for their commitment during field and lab work. This research was additionally funded by the Czech Ministry of Education Project "Geographical Systems and Risk Processes in the Context of Global Change and European Integration" (MSM 0021620831), and the Czech Ministry of Agriculture Project "Water Retention in the River Flood – Plain Areas" (QH82078).
