Articles | Volume 27, issue 1
Technical note
09 Jan 2023
Technical note |  | 09 Jan 2023

Technical note: Extending the SWAT model to transport chemicals through tile and groundwater flow

Hendrik Rathjens, Jens Kiesel, Michael Winchell, Jeffrey Arnold, and Robin Sur

Related subject area

Subject: Catchment hydrology | Techniques and Approaches: Modelling approaches
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Hydrol. Earth Syst. Sci., 27, 495–499,,, 2023
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Cited articles

Arabi, M., Frankenberger, J. R., Engel, B., and Arnold, J. G.: Representation of agricultural management practices with SWAT, Hydrol. Process., 22, 3042–3055, 2008. 
Arnold, J. G., Srinivasan, R., Muttiah, R. S., and Williams, J. R.: Large-area hydrologic modeling and assessment: part I. model development, Am. Wat. Res., 34, 73–89, 1998. 
Bannwarth, M. A., Sangchan, W., Hugenschmidt, C., Lamers, M., Ingwersen, J., Ziegler, A. D., and Streck, T.: Pesticide transport simulation in a tropical catchment by SWAT, Environ. Pollut., 191, 70–79, 2014. 
Bayer Crop Science: Bayer Crop Science Internal Report 1, 144 pp., 2018. 
Bieger, K., Arnold, J. G., Rathjens, H., White, M. J., Bosch, D. D., Allen, P. M., Volk, M., and Srinivasan, R.: Introduction to SWAT+, A Completely Restructured Version of the Soil and Water Assessment Tool, J. Am. Water Resour. As., 53, 115–130,, 2017. 
Short summary
The SWAT model can simulate the transport of water-soluble chemicals through the landscape but neglects the transport through groundwater or agricultural tile drains. These transport pathways are, however, important to assess the amount of chemicals in streams. We added this capability to the model, which significantly improved the simulation. The representation of all transport pathways in the model enables watershed managers to develop robust strategies for reducing chemicals in streams.