Note: linking WEAP to MODPATH is an advanced feature.

MODPATH is a groundwater particle tracking post-processing package that was developed to compute three-dimensional flow paths using output from steady-state or transient groundwater flow simulations by MODFLOW, the U. S. Geological Survey (USGS) finite-difference groundwater flow model.  Its purpose is to evaluate advective transport through a model.  MODPATH uses a semi-analytical particle tracking scheme that allows an analytical expression of the particle’s flow path to be obtained within each finite-difference grid cell. Particle paths are computed by tracking particles from one cell to the next until the particle reaches a boundary, an internal sink/source, or satisfies some other termination criterion.  The version of MODPATH that WEAP is designed to link to is MODPATH 5.0.

For more information, please see the Appendix on linking WEAP to MODPATH.