In this study two approaches are presented to identify Dominant RunoffProcesses (DRP) with respect to regionalization. The approaches are asimplification of an existing method to determine DRP by means of anextensive field campaign. The first approach combines the permeability ofthe substratum, land-use and slope of the basin in a GIS-based analysis. Thesecond approach makes use of discriminant analysis of the physiographiccharacteristics of the basin and links it to the GIS analysis. The resultsof the developed approaches are maps, which identify dominant runoffprocesses and represent a spatial distribution of the hydrological behaviourof the soil during prolonged rainfall events. The approaches have beendeveloped in a micro-scale basin (Germany). An additional meso-scale basinwas introduced in which the two approaches were applied for quality control.The thus generated maps for the micro-scale basin were compared with anexisting DRP map, which was derived with the existing method. The firstapproach showed a resemblance of 79% when compared to this map, whereasthe second approach showed only a resemblance of 51%. The generated mapsfor the meso-scale basin were compared to DRP that were determined pointwise according to the existing method. The first approach showed in thiscase a resemblance of 81%, whereas the second approach showed aresemblance of 68%. Therefore, the first approach is preferred to thesecond approach when accuracy, data input and calculation time areconcerned.
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