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Predicted Concentrations for Pesticides in Drainage Dominated Catchments |
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| Authors: | Patrik Fauser Marianne Thomsen Peter B Sørensen Søren Petersen |
| Institution: | 1. Department of Policy Analysis, National Environmental Research Institute, Frederiksborgvej 399, Post Box 358, 4000, Roskilde, Denmark 2. Department of Terrestrial Ecology, National Environmental Research Institute, Vejls?vej 25, Post box 314, 8600, Silkeborg, Denmark 3. Water and Environment, Danish Hydraulic Institute, Agern Allé 5, 2970, H?rsholm, Denmark |
| Abstract: | Regulators need a reliable, precise and easy to use tool for predicting the occurrence of pesticides in drain water and catchments in agricultural areas. Occurrence depends on a wide range of substance and site specific factors and this study presents a simple model built on the results from simulations of a detailed model system that does not neglect or omit any of these factors. A drainage dominated sub-catchment (0.03 km2) of the Lillebaek catchment (4.4 km2) on Funen, Denmark, represented by the catchment model MIKE SHE is considered. Detailed analyses have been made with respect to geological and hydrodynamic conditions as well as measurements of pesticide concentrations in ground and surface waters. Maximum concentrations in drain water, the time for reaching this concentration and the time interval for exceeding the limit value have been derived empirically from MIKE SHE simulations using degradation rates and sorption coefficients values for 37 pesticides included in the Danish PATE database. The relatively hydrophilic bentazon and hydrophobic pendimethalin are used as model pesticides for illustration. A simple tool applicable for a wide range of pesticides has thus been designed based on detailed analyses of a limited number of pesticides. The user requirements are degradation rates, sorption coefficients, application rates and regulatory limit values for the pesticides of interest. |
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