Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 5 Proceedings of the 8th Workshop for Large Scale Hydrological Modelling - Oppurg 2004 2005 10.5194/adgeo-5-105-2005 http://www.adv-geosci.net/5/105/2005/ http://www.adv-geosci.net/5/105/2005/adgeo-5-105-2005.html http://www.adv-geosci.net/5/105/2005/adgeo-5-105-2005.pdf 105 111 2005-12-16 Conceptualization and implementation of a regional groundwater model for the Neckar catchment in the framework of an integrated regional model J. Jagelke R. Barthel Institute of Hydraulic Engineering, Universitaet Stuttgart, Germany Joint modelling of surface and subsurface systems is necessary to assess the quantity and quality of the water resources in a watershed. Therefore, it is widely applied in integrated regional models. <P style="line-height: 20px;"> The presented study deals with groundwater modelling within the framework of the integrated regional model MOSDEW, which is being developed for the Neckar catchment in Germany with the objective of contributing to the implementation of the EU Water Framework Directive (EU-WFD) (<TT><A NAME="tex2html1" HREF="www.rivertwin.org">www.rivertwin.org</A></TT>). The groundwater model aims at obtaining a better understanding of the groundwater recharge processes and at evaluating the groundwater resources on watershed scale. In this paper the developed coupling method is described. Furthermore the groundwater model construction based on the available database and first calibration results are presented.