PHREEQC does not solve the unsaturated zone equations for flow and transport. Flow can be reversed, but it must be manually specified. I don't know of any publicly available codes for treating unsaturated transport with reactions. Our Dept of Energy National labs have such codes as well as the Waterloo University in Canada, but I don't think they are available for distribution. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Michael Zilberbrand To: 'David L Parkhurst' <dlpark@xxxxxxxx> <w_mzilberbrand@x cc: In-Reply-To: <01C0F8C7.4016CBB0@xxxxxxxxxx> ail.gov.il> Subject: Unsaturated transport with reactions 06/19/01 06:53 AM Dear David, I would like to model vertical transport in 2-m soil layer with reactions, including water evaporation, carbonate precipitation-dissolution etc. Actually, water extraction should change vertical flow velocity. Is it possible to use PHREEQC for such problems? Do you know software treating the unsaturated transport with reactions? Thank you for your help. Sincerely, Michael Zilberbrand
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