Dresden Groundwater Research Centre, Meraner Straße 10, 01187 Dresden, Germany

TU Dresden, Institute for Urban Water Management, 01062 Dresden, Germany

Fraunhofer Institut für Techno- und Wirtschaftsmathematik (ITWM), Fraunhoferplatz, 67663 Kaiserslautern, Germany

Helmholtz Centre for Environmental Research – UFZ, Permoserstraße 15, 04318 Leipzig, Germany

Helmholtz Centre for Environmental Research – UFZ, Permoserstraße 15, 04318 Leipzig, Germany

now at: Landesbetrieb für Hochwasserschutz und Wasserwirtschaft, Magdeburg, Germany

Fraunhofer Institute for Algorithms and Scientific Computing (SCAI), Schloss Birlinghoven, 53754 Sankt Augustin, Germany

Fraunhofer Institute for Algorithms and Scientific Computing (SCAI), Schloss Birlinghoven, 53754 Sankt Augustin, Germany

Dresden Groundwater Research Centre, Meraner Straße 10, 01187 Dresden, Germany

now at: Ingenieurbüro für Grundwasser, Leipzig, Germany

Environmental Office of Capital Dresden, Grunaer Straße 2, 01069 Dresden, Germay