Typically, areal sources may be used to represent leaky septic tanks, cesspools, or areas of surface and subsurface disposal of waste water. Line sources may be used to represent leaky sewer lines or pipes. Barrier or stream boundary conditions that exist over the entire aquifer depth can be simulated. The viral breakthrough curve at the water table computed with this module is used as input for the LTG2D module. For the transport equation a numerical approximation is obtained using an upstream- weighted finite element method and linear elements.
Time integration is performed using a central difference formulation.
This module also delineates ground-water flow pathlines and well capture zones.