In this project a regional spatially distributed model was developed to predict pesticide leaching from agricultural areas in Flanders. Calculations start from the agricultural use map for Flanders, the map with depth of phreatic groundwater level and climate data (rainfall, evapotranspiration) for a reference period of 20 years. The model is a GIS extension of the PEARL model that is used at the EU level as one of the standard models for pesticide registration. The results are maps with the geographically distributed leaching of a pesticide. This output allows to derive vulnerability maps of leaching of pesticides to groundwater.