How do I model a horizontal drain?

Many people use RS2 to test different drain configurations.  

To model drainage, there are two options:

  • use the zero pressure boundary condition at the location of the drainage layer
  • set the permeability of the drainage layer to a very high, but reasonable, value (i.e. k=1 m/s)


Tutorial 21 details how to model a levee with a toe drain.  In this case, the horizontal drain is modeled using the zero pressure boundary condition.


Horizontal drain modeled using zero pressure boundary conditions