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SEEPAGE, a new MODFLOW DRAIN package.

O Batelaan1, F De Smedt

  • 1Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium. batelaan@vub.ac.be

Ground Water
|August 21, 2004
PubMed
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Accurately predicting groundwater discharge areas is vital for wetland protection. A new SEEPAGE package for MODFLOW improves groundwater modeling, offering more precise delineation of these crucial discharge zones.

Area of Science:

  • Hydrogeology
  • Environmental Modeling
  • Wetland Science

Background:

  • Accurate prediction of groundwater discharge areas is essential for protecting groundwater-dependent wetlands.
  • Current MODFLOW DRAIN package simulations present challenges, including water table inaccuracies and parameterization difficulties.
  • These limitations hinder effective management and restoration of wetland ecosystems.

Purpose of the Study:

  • To introduce and validate a new SEEPAGE package for MODFLOW to enhance groundwater discharge area prediction.
  • To address the limitations of the existing DRAIN package in simulating groundwater discharge.
  • To improve the accuracy and reliability of hydrological models for wetland management.

Main Methods:

  • Development of a novel SEEPAGE package for MODFLOW, featuring adaptable constant head cells.

Related Experiment Videos

  • Verification of the SEEPAGE package using a homogeneous, isotropic, linear sloping profile to estimate groundwater discharge location.
  • Comparison of SEEPAGE package results against the traditional DRAIN package solution.

    • Main Results:

    • The SEEPAGE package effectively simulates groundwater discharge areas with improved accuracy.
    • It overcomes conceptual and practical issues associated with the DRAIN package, such as elevated water tables and large water balance errors.
    • Application in Belgian basins demonstrated the SEEPAGE package's utility in defining upper boundaries for free water tables and drainage resistance.

    Conclusions:

    • The SEEPAGE package offers a more accurate method for identifying and delineating regional groundwater discharge areas compared to the DRAIN package.
    • It provides a valuable tool for hydrogeological studies and the sustainable management of groundwater-dependent ecosystems.
    • The package can be integrated with the DRAIN package for complex hydrological scenarios requiring precise water table and drainage control.