1. Department of Earth Sciences Universität Hamburg, Institute for Geology Hamburg Germany
2. Department of Hydrology, Water Management and Water Protection Technische Universität Braunschweig, Leichtweiß Institute for Hydraulic Engineering and Water Resources Braunschweig Germany
3. Institute for Water Research Rhodes University Makhanda/Grahamstown South Africa
4. Department of Water Resources Management and Rights Oldenburg‐East Frisian Water Board Brake Germany