1. General Model Information

Name: SoilFug - A Fugacity Model of Pesticide Runoff to Surface Water

Acronym: SOILFUG

Main medium: terrestrial, aquatic
Main subject: biogeochemistry, hydrology
Organization level: ecosystem
Type of model: compartment model
Main application:
Keywords: pesticide, runoff, soil, surface water, fugacity approach


Environmental Modelling Centre
1600 West Bank Drive, Peterborough, Ontario, Canada, K9J 7B8



The SoilFug model assesses the potential for reaction, degradation and leaching of a pesticide applied to a surface soil. The model includes a database of chemicals and soil types, however, the user can easily define new chemicals and soils. Output can be viewed as either tables or graphs.

This program was based on the following publications:

Di Guardo, A., Calamari et al. 1994, Di Guardo, A.,Williams et al. 1994 and Barra et al. 1995.

For a simpler, DOS version, use the Soil model.

II. Technical Information

II.1 Executables:

Operating System(s): Windows 3.11 or higher
This program is only available in compiled form. To run this program you will need a computer running either MS Windows 3.1 or Windows 95. The zipped file is 986KB and is self-expanding to about 2.26 MB. A "setup.txt" file with more detailed technical information is included in the zipped file.

Register to Download

II.2 Source-code:

Programming Language(s): BASIC, VISUAL BASIC
For the BASIC version see Available Models at the Environmetal Modelling Centre

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

The required input data are:
Chemical Properties:
  • chemical name
  • molecular mass
  • water solubility
  • vapour pressure
  • organic carbon partition coefficient, Koc, OR
    the log octanol-water partition coefficient, log Kow
  • mineral-water partition coefficient
  • degradation half-life
  • Dosage:

  • times, durations, and deposition depths of up to 20 rain events
  • individual time, dosage of, and area covered by up to ten pesticide applications
  • Soil Properties:

  • basin area
  • soil depth
  • diffusive depth
  • region temperature
  • volume fractions of air and water
  • mass fraction of organic carbon
  • III.2.2 Output

    Model output includes:
  • D values
  • system fugacity
  • concentrations of pesticide in the soil and in the basin water
  • pesticide losses by each of runoff, degradation, and volatilization over the 20 rain events

  • IV. References

  • D. Mackay 1991 "Multimedia Environmental Models; The Fugacity Approach" Lewis Publishers, CRC Press. pp 193-198.
  • Di Guardo, A., Calamari, D., Zanin, G., Consalter, A., and Mackay, D. "A Fugacity Model of Pesticide Runoff to Surface Water: Development and Validation", Chemosphere, 23, 511-531, 1994.
  • Di Guardo, A.,Williams, R.J.,Mattiessen, P., Brooke, D.N., and Calamari, D. " Simulation of Pesticide Runoff at Rosemaund Farm (UK) Using the SoilFug Model", Environ. Sci. & Pollut. Res. 1, 151-160, 1994.
  • Barra, R., Vighi M., and Di Guardo, A. "Prediction of Surface Water Input of Chloridazon and Chlorpyrifos from an Agricultural Watershed in Chile", Chemosphere, 30, 485-500, 1995.

  • V. Further information in the World-Wide-Web

  • Available Models at the Environmetal Modelling Centre
  • Soil model with fugacity approach (Basic)
  • SoilFug (Windows)

    VI. Additional remarks

    Last review of this document by:
    Status of the document:
    last modified by Tobias Gabele Wed Aug 21 21:44:49 CEST 2002

    Go back to Register of Ecological Models (R E M)