Our research group has developed a watershed modeling code that links the popular SWAT model with the groundwater flow model MODFLOW. The model uses the SWAT model as the base code, with MODFLOW call as the groundwater subroutine. SWAT provides MODFLOW with recharge, and MODFLOW provides SWAT with groundwater discharge to streams. SWAT retains all land surface and stream routing functionality. The groundwater reactive transport code RT3D has also been implemented into the code to simulate groundwater nitrate transport and loading to streams.

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SWAT-MODFLOW can be downloaded here. This contains the source code, executable, tutorial, and example model.

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QSWATMOD is a QGIS plug-in tool that can be used to link SWAT and MODFLOW models, run simulations, and view results. It was created by Dr. Seonggyu Park.

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SWAT-MODFLOW has been used in the following regions:

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• Upper Klamath River Basin, Oregon, USA (paper)

• Odderbæk catchment, Denmark (paper)

• Arkansas River Valley, Colorado, USA (paper)

• Limpopo River Basin, southern Afria (paper)

• South Platte River Basin, Colorado, USA (paper)

• Others

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SWAT-MODFLOW-RT3D has been applied to the Upper Klamath River Basin, Oregon, USA.

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Collaboration Between: