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Re: Phreeqe

phreeqC is definitely the superior model relative to phreeqE. The types of
chemistry include surface complexation, solid solutions, and general
kinetics, which are not available with phreeqE. Input for phreeqC is much
simpler. There are many other improvements and features that are present in

We have linked phreeqC with a Fortran solute transport model and have not
had any problems with computational inefficiency related to mixing the


David Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled

                      "Ashok Katyal"                                                                       
                      <ashok@xxxxxxxxxx        To:       <dlpark@xxxxxxxx>                                 
                      >                        cc:                                                         
                                               Subject:  Re: Phreeqe                                       
                      10/08/2003 11:30                                                                     

Dear Dr. Parkhurst:

We are planning to link a variably saturated 3D flow, and fate and
transport model with Phreeqe/Phreeqc that you have developed.  After
reading USGS website I found that "PHREEQE is now obsolete and has been
replaced with the program PHREEQC".  Our fate and transport model is in
FORTRAN, and linking with PHREEQC (written in C) may not be computationally
as efficient as linking with PHREEQE (fortran version) -- although creating
a DLL may be an option worth investigation.  We will appreciate any advise
you may have for us in this matter.

Many thanks.

Ashok Katyal, Ph.D.
Principal Enginner


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