10.4122/1.1000001115 Mohrlok, U. Wolf, L. Klinger, J. Estimation of urban groundwater recharge from different sources by quantifying soil seepage processes DTU Library, Technical University of Denmark (DTU) 2005 Integrated urban water management urban groundwater recharge seepage processes GIS application University of Karlsruhe, Institute for Hydromechanics University of Karlsruhe, Applied Geology en Conference presentation 10.4122/1.1000001116 text/xml 1 The implementation of subsurface processes into the integrated urban water system is essential for an integrated urban water and mass balance as a base for predicting the evolution of water quality in order to establish sustainable integrated urban water systems. In particular, the processes of urban groundwater recharge and discharge provide an important transport path for nutrients and pollutants from the surface and subsurface, e.g. contaminated sites or sewer leaks, to surface waters in urban areas. Urban groundwater balances require the estimation of urban groundwater recharge which is determined by seepage flow through unsaturated soils generated by infiltrations to the subsurface from different sources. Because of the very large complexity caused by the variability of soils, sources and hydraulic boundary conditions several physically based approaches have been developed to simplify the seepage processes from independent infiltration sources. The considered large spatial variability of the soil properties and the hydraulic boundary conditions were managed by GIS applications. Recharge rates for individual sources in a case study city were estimated using several classification methods.