EGU21-9514, updated on 04 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Assessment of groundwater contamination by chlorpyrifos using the PWC model in Valencia Region (Spain)

Ricardo Pérez Indoval, Javier Rodrigo-Ilarri, and Eduardo Cassiraga
Ricardo Pérez Indoval et al.
  • Grupo de Hidrogeología, Instituto de Ingeniería del Agua y Medio Ambiente (IIAMA), Universitat Politècnica de València (UPV) (

Chlorpyrifos is commoly used as an pesticide to control weeds and prevent nondesirable grow of algae, fungi and bacteria in many agricultural applications. Despite its highly negative effects on human health, environmental modeling of this kind of pesticide in the groundwater is not commonly done in real situations. Predicting the fate of pesticides released into the natural environment is necessary to anticipate and minimize adverse effects both at close and long distances from the contamination source. A number of models have been developed to predict the behavior, mobility, and persistence of pesticides. These models should account for key hydrological and agricultural processes, such as crop growth, pesticide application patterns, transformation processes and field management practices.

This work shows results obtained by the Pesticide Water Calculator (PWC) model to simulate the behavior of chlorpyrifos. PWC model is used as a standard pesticide simulation model in USA and in this work it has been used to  simulate the fate and transport of chlorpyrifos in the unsaturated zone of the aquifer. The model uses a whole set of parameters to solve a modified version of the mass transport equation considering the combined effect of advection, dispersion and reactive transport processes. PWC is used to estimate the daily concentrations of chlorpyrifos in the Buñol-Cheste aquifer in Valencia Region(Spain).

A whole set of simulation scenarios have been designed to perform a parameter sensitivity analysis. Results of the PWC model obtained in this study represents a crucial first step towards the development of a pesticide risk assessment in Valencia Region. Results show that numerical simulation is a valid tool for the analysis and prediction of the fate  and transport of pesticides in the groundwater.

How to cite: Pérez Indoval, R., Rodrigo-Ilarri, J., and Cassiraga, E.: Assessment of groundwater contamination by chlorpyrifos using the PWC model in Valencia Region (Spain), EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9514,, 2021.

Comments on the display

to access the discussion