MODFLOW-SURFACT Overview

MODFLOW SURFACT is Comprehensive 3D finite-difference flow and contaminant transport mode based on the USGS modular groundwater flow model, MODFLOW.

» Overview

MODFLOW-SURFACT Flow (Basic)

  • Includes fracture well package (FWL4)
  • Includes new flow package (BCF4)
  • Includes new recharge/seepage face package (RSF4)
  • Includes new Adaptive Time Stepping and Output Control Package (ATO4)
  • Includes new Preconditioned Conjugate Gradient Package containing a new PCG matrix solver (PCG4)
  • Includes new Newton Raphson linearization package with backtracking (NRB1)
  • Will simulate complete desaturation and saturation of grid blocks
  • No transport
  • No unsaturated zone flow
  • No vapor flow

MODFLOW-SURFACT Flow (Advanced)

  • Includes fracture well package (FWL4)
  • Includes new flow package (BCF4)
  • Includes new recharge/seepage face package (RSF4)
  • Includes new Adaptive Time Stepping and Output Control Package (ATO4)
  • Includes new Preconditioned Conjugate Gradient Package containing a new PCG matrix solver (PCG4)
  • Includes new Newton Raphson linearization package with backtracking (NRB1)
  • Will simulate complete desaturation and saturation of grid blocks
  • Will simulate unsaturated flow
  • No transport
  • Includes vapor flow

MODFLOW-SURFACT Transport (Basic)*

  • Includes fracture well package (FWL4)
  • Includes new flow package (BCF4)
  • Includes new recharge/seepage face package (RSF4)
  • Includes new Adaptive Time Stepping and Output Control Package (ATO4)
  • Includes new Preconditioned Conjugate Gradient Package containing a new PCG matrix solver (PCG4)
  • Includes new Newton Raphson linearization package with backtracking (NRB1)
  • Will simulate complete desaturation and saturation of grid blocks
  • Solute transport is available
  • No unsaturated zone flow
  • No vapor flow

MODFLOW-SURFACT Transport (Advanced)*


  • Includes fracture well package (FWL4)
  • Includes new flow package (BCF4)
  • Includes new recharge/seepage face package (RSF4)
  • Includes new Adaptive Time Stepping and Output Control Package (ATO4)
  • Includes new Preconditioned Conjugate Gradient Package containing a new PCG matrix solver (PCG4)
  • Includes new Newton Raphson linearization package with backtracking (NRB1)
  • Will simulate complete desaturation and saturation of grid blocks
  • Will simulate unsaturated flow
  • Includes fractured flow and dual porosity
  • Includes solute transport, multiphase transport, NAPL dissolution and volatilization
  • Includes vapor flow