Hydrological and water quality modelling in a medium-sized coastal basin

The SWAT model, coupled to a GIS, was applied to the Kerava watershed (Sout h of Finland), an agricultural subbasin of the Vantaa watershed draining in to the Baltic Sea. The model was adapted to the specific conditions of the catchment by adding a weather generator and a snow melt submodel calibrated for Finland. A forested sub-basin was used to calibrate the forest paramet ers. The hydrological and water-quality simulation results were compared wi th daily measured series and monthly averages in terms of water outflows an d nitrogen and phosphorus loads. Good agreement was found between measured and predicted values. (C) 2000 Elsevier Science Ltd. All rights reserved.