Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 9 4 2009 10.5194/nhess-9-1047-2009 http://www.nat-hazards-earth-syst-sci.net/9/1047/2009/ http://www.nat-hazards-earth-syst-sci.net/9/1047/2009/nhess-9-1047-2009.html http://www.nat-hazards-earth-syst-sci.net/9/1047/2009/nhess-9-1047-2009.pdf 1047 1058 2009-07-06 Contaminant transport to public water supply wells via flood water retention areas D. Kühlers E. Bethge G. Hillebrand H. Hollert M. Fleig B. Lehmann D. Maier M. Maier U. Mohrlok J. Wölz Stadtwerke Karlsruhe GmbH (SWK), Karlsruhe, Germany Institute for Hydromechanics (IfH), Karlsruhe, Germany Institute for Water and River Basin Management (IWG), Karlsruhe, Germany Institute for Environmental Research (IfU), Aachen, Germany DVGW-Technologiezentrum Wasser (TZW), Karlsruhe, Germany Heinrich-Sontheimer-Laboratorium (HSL), Karlsruhe, Germany The essential processes and mechanisms of the transport of contaminants from a river to a well field via a flood water retention area are presented. The transport is conceptualized as a succession of three phases: (1) contaminant entry into the retention area, (2) passage through the soil zone and (3) transport with the groundwater flow. Depending on the conditions of a given location and on the properties of the contaminants of interest, processes within each transport phase may reduce the concentration of the contaminants at the well field. 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