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Water balance of wetlands within lowland floodplains is stronglyinfluenced by the temporally variable spatial extent of the interactionsbetween groundwater and surface water. A robust algorithm will be introducedwhich makes it possible to delineate the interaction zone between thelowland river and the floodplain. This interaction zone is specified as the"Direct Catchment" which is defined by the part of the connectedfloodplain in which wetland water balance is mainly affected by the surfacewater dynamics of the adjacent river. The delineation algorithm is based ontransfer functions which were assessed by local simulation results of theintegrated water balance and nutrient dynamics model IWAN. The transferfunctions are further determined by mean annual groundwater depths and bysimulated groundwater dynamics. They are controlled by simulation results ofthe maximal transversal extent of surface water influence on groundwaterstages. The regionalisation of the developed delineation algorithm leads tothe specification of the maximal extent of groundwater - surface water -interaction processes along the river. By application of this approach tothe Havel River basin, located within lowlands of Northeaster Germany, itwas possible to specify a 998.1 km<sup>2</sup> part of the floodplain which isdirectly connected with the surface waters and thus called the "DirectCatchment" of the Havel river. The IWAN model was applied to simulate thewater balance of the floodplain. The simulation results prove the tightinteraction between river and floodplain. It is shown that the spatially andtemporally variable influences of the connected floodplain on the riverdischarge were only important during low discharge in summer

An advanced approach for catchment delineation and water balance modelling within wetlands and floodplains