PLPROC is a member of the PEST suite. Its primary use is for pilot points parameterization of models that use both structured and unstructured grids.
This tutorial offers a quick overview of PLPROC in pilot points parameterization of a MODFLOW-USG model. Other utility programs from the PEST suite are also demonstrated. These translate data that is resident in MODFLOW-USG input and output files to formats that are easily read by the PARAVIEW visualization package.