Different simulation software tools were evaluated for small-scale modelling of the Kleine Ronse brook. The InfoWorks modelling package (www.wallingfordsoftware.com) was selected based on the objectives that were put forward by Leiedal, the intermunicipal society of the Kortrijk region. The Kleine Ronsebeek brook catchment model was developed in the InfoWorks platform. Initial calibration of the model was based on a I month measurement campaign (August-September 2006) and a limited number of measurements were performed in the winter period (February 2007). Flow rate, ammonium concentration and COD concentration were measured at three points in the catchment area. Further, rain data recorded in July 2006 was used. Additional measurements will be necessary before the model can be used for scenario analysis, although initial calibration and simulation results are promising,