Within the project Micropollutant emissions of urban catchments out of waste water treatment plants, stormwater discharges and combined sewer overflows (SCHTURM) organic and inorganic micropollutant emissions from several entry paths (effluent of waste water treatment plants, combined sewer overflows or stormwater discharges from urban areas and highways) to surface water and ground water bodies during storm events should be estimated. The aim is to estimate certain micropollutant loads from these entry paths for the whole of Austria for the first time to get a first estimation about the main entry paths of the investigated substances. In the selected catchments a sampling campaign to collect samples of whole storm water events should be accomplished. Furthermore a mathematical estimation of the discharged storm water and rain water loads is intended. This estimation should be done under specific assumptions for several scenarios. Based on the results combined with measurements in the defined catchments a quantification of the several entry paths for the whole area of Austria should be done. By this project general data should be generated to serve as a basis for decisionmaking.