title: Development and application of a catchment scale pesticide fate and transport model for use in drinking water risk assessment.
abstract: This paper describes the development and application of IMPT (Integrated Model for Pesticide Transport), a parameter-efficient tool for predicting diffuse-source pesticide concentrations in surface waters used for drinking water supply. The model was applied to a small UK headwater catchment with high frequency (8h) pesticide monitoring data and to five larger catchments (479-1653km(2)) with sampling approximately every 14days. Model performance was good for predictions of both flow (Nash Sutcliffe Efficiency generally >0.59 and PBIAS <10%) and pesticide concentrations, although low sampling frequency in the larger catchments is likely to mask the true episodic nature of exposure. The computational efficiency of the model, along with the fact that most of its parameters can be derived from existing national soil property data mean that it can be used to rapidly predict pesticide exposure in multiple surface water resources to support operational and strategic risk assessments.
authors.affiliation: Cranfield University, Cranfield, Bedfordshire, UK; TSGE Consulting, UK.
authors.forename: S P
authors.initials: SP
authors.lastname: Pullan
authors.affiliation: Department of Geography, University of Leicester, Leicester, UK. Electronic address: mjw72@le.ac.uk.
authors.forename: M J
authors.initials: MJ
authors.lastname: Whelan
authors.affiliation: Severn Trent Water, Coventry, UK.
authors.forename: J
authors.initials: J
authors.lastname: Rettino
authors.affiliation: Severn Trent Water, Coventry, UK.
authors.forename: K
authors.initials: K
authors.lastname: Filby
authors.affiliation: Anglian Water, Cambridge, UK.
authors.forename: S
authors.initials: S
authors.lastname: Eyre
authors.affiliation: Cranfield University, Cranfield, Bedfordshire, UK.
authors.forename: I P
authors.initials: IP
authors.lastname: Holman
mesh_terms: D060766:Drinking Water / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D008962:Models, Theoretical; D010575:Pesticides / Q000032:analysis*; D018570:Risk Assessment; D014874:Water Pollutants, Chemical / Q000032:analysis*; D062066:Water Resources
chemical_list: D060766:Drinking Water; D010575:Pesticides; D014874:Water Pollutants, Chemical
keywords: Catchment scale model; Diffuse pesticide transfer; Drainflow; Drinking water resources; Parameter-efficient