Dr. Parkhurst I'm a new user of PHREEQC and I had been carrying around a couple questions that your e-mail stimulated. Here goes: As I (and my students) read the manual, there are two possible boundary conditions for the end of the domain: 1) constant concetration, or 2) constant flux (3rd type). My student was unable to implement the zero derivative condition. My experience with interpreting column experiments has led me to adopt either a zero-derivative or semi-infinite condition for the exit (domain end). Certainly, a constant concentration or constant flux is not applicable to most common experimental conditions. It seems like it would be straightforward to implement the other conditions. Am I misunderstanding something here? Thanks Alan Rabideau -- Alan J. Rabideau Associate Professor Department of Civil, Structural, and Environmental Engineering State University of New York at Buffalo 207 Jarvis Hall, Buffalo, NY 14260-4300 voice: 716-645-2114 x 2327 fax: 716-645-3667 e-mail: rabideau@xxxxxxxxxxxxxxx
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