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Updated: Apr 24, 2026

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A MODFLOW Infiltration Device Package for Simulating Storm Water Infiltration.

Jan Jeppesen, Steen Christensen1

  • 1Department of Geoscience, University of Aarhus, Høegh-Guldbergsgade 2, Bld. 1671-217, DK-8000 Aarhus C, Aarhus, Denmark.

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Summary
This summary is machine-generated.

The new MODFLOW Infiltration Device (INFD) Package accurately simulates infiltration devices and their groundwater interactions. It offers improved accuracy and efficiency for modeling stormwater management systems.

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Area of Science:

  • Hydrogeology
  • Environmental Engineering
  • Water Resource Management

Background:

  • Simulating infiltration devices and their interaction with groundwater is crucial for effective stormwater management.
  • Existing models may lack the accuracy or efficiency needed for complex transient simulations.

Purpose of the Study:

  • To introduce and evaluate the MODFLOW Infiltration Device (INFD) Package for simulating infiltration devices and their two-way interaction with groundwater.
  • To assess the accuracy and efficiency of the INFD Package compared to existing methods.

Main Methods:

  • Developed the INFD Package based on a water balance approach, including inflow, seepage, overflow, and storage.
  • Implemented multi-time step simulation within a single MODFLOW time step.
  • Conducted benchmark tests comparing the INFD Package's analytical solution with numerical solutions from the MODFLOW Surface-Water Routing (SWR1) Process.
  • Performed transient simulations of a hypothetical catchment to demonstrate device-groundwater interactions.

Main Results:

  • The INFD Package's analytical solution for stage provides exact results for transient behavior.
  • The INFD Package achieves higher accuracy than SWR1 with fewer time steps.
  • The INFD Package simulates lower infiltration rates than SWR1 due to an improved representation of flow through device sides.
  • Simulations show that the unsaturated zone thickness significantly influences device-groundwater interaction, affecting groundwater table response.

Conclusions:

  • The INFD Package provides an integrated and accurate method for simulating infiltration devices and their interaction with groundwater.
  • The package is suitable for both small and large spatial and temporal scales.
  • The INFD Package enhances the capability of MODFLOW for hydrological modeling of urban and engineered water systems.