1. Department of Geosciences University of Tübingen Tübingen Germany
2. Now at Department of Civil and Environmental Engineering University of Illinois at Urbana‐Champaign Urbana IL USA
3. Biogeophysics Institute of Soil Science and Land Evaluation University of Hohenheim Stuttgart Germany
4. Civil and Environmental Engineering University of Kassel Kassel Germany
5. Department of Earth and Environmental Sciences Water Institute University of Waterloo Waterloo ON Canada