MODHMS® delivers a physically based, spatially distributed, conjunctive surface/subsurface modeling framework that gives water resources managers unsurpassed capability to simulate the complete hydrologic cycle and to take into account all relevant processes and hydrologic interactions.

Model Grid with Channel Representation


MODHMS®, HGL’s latest and most advanced software code, interfaces seamlessly with the popular MODFLOW code to provide a physically based, spatially distributed, integrated surface/subsurface modeling framework hydrologic system. Developed to meet the growing demand for quantifying available water within a hydrologic system and for numerical simulation of complex hydrological processes, MODHMS® extends our MODFLOW-SURFACT subsurface modeling code to include overland/channel flow and transport. We use these tools to give water resources managers unsurpassed capability to simulate the complete hydrological cycle and address the following complex water resources management issues including:

  • Integrated water resource assessment
  • Groundwater availability & safe-yield analysis
  • Conjunctive surface water-groundwater management
  • Stream flow restoration
  • Watershed/ wetland management and engineering
  • Flood prediction and mitigation
  • Agricultural irrigation management
  • Cleanup of industrial contaminants
  • Fluvial hydraulic analysis

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See animations below to view how MODHMS® can be used for vulnerability assessments; to model surface and subsurface systems; and for contaminant fate and transport analysis.

Use of MODHMS® for Vulnerability Assessments (Runtime 1:37)
Use of MODHMS®to Model Surface and Subsurface Systems (Runtime 2:00)
Overview of MODHMS® for Contaminant Fate and Transport Analysis (Runtime 1:23)

Advanced Features:
    • Fully implicit coupling of all hydrologic regimes for mass-conserved and robust solutions to systems with strong interactions between regimes
    • Subsurface and surficial density-dependent flow and transport
    • Curvilinear grid option to conform model to geometric or topographic features
    • Friction formulas for surface flow and retention formulas for unsaturated, flow including pseudo-soil functions representing unconfined flow
    • Adaptive time-stepping for speed and accuracy
    • Picard and Newton-Raphson schemes for efficiency and robustness of non-linear flow solutions
    • Implicit TVD transport schemes for highly accurate, physically consistent transport solutions
    • Advanced PCG and ORTHOMIN solvers
    • Surface Flow Module can handle small or cell-scale hydrologic features, and direct flow links between surface and subsurface components
    • All advanced capabilities available in MODFLOW-SURFACTTM

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