This program combines the one-dimensional pesticide leaching model PEARL with a geographical information system to calculate the leaching potential of pesticides into local surface waters and the regional groundwater. To describe seepage and drainage fluxes, the model was loosely coupled with a regional groundwater model. Simulations carried out for four different pesticides showed that the average fluxes of pesticide into local surface waters were higher than the average fluxes of pesticide into the regional groundwater. The behaviour of the different substances differed substantially (Tiktak et al., 2002).


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