1. Institute of Urban Water Management, Kaiserslautern University of Technology, Paul-Ehrlich-Straße 13, 67663 Kaiserslautern, Germany
2. Urban Water Management, University of Luxembourg, 6, rue Richard Coudenhove-Kalergi, L-1359 Luxembourg, Luxembourg
3. Dr. Siekmann + Partner GmbH, Segbachstraße 9, 56743 Thür, Germany