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Last updated on Fri 07 Feb 1997 at 02:20 PM
The following message is from Gregory J Ruskauff. I neither endorse nor reject his opinion.
Date sent: Thu, 18 Jul 1996 07:11:44 -0700 From: Doug Walker
Organization: INTERA Inc To: email@example.com Subject: some commercial software I don't use a commercial version of MODFLOW, but I do use some of the other software you mention on your page that I have a few opinions on. PEST in conjunction with Groundwater Vistas and MODFLOW is a very nice combination. PEST is about the most flexible implementation of the Levenberg-Marquardt method I have seen, and coupled with ease of preparing input files with GV and GV's own calibration assessment tools makes calibrating MODFLOW models more efficient than ever. PEST is missing some diagnostic statistics that I think it should include (e.g. sensitivity coefficients), but I have written the author and they are likely to be included in the next version. Unlike MODFLOWP any model parameter can be estimated (heads, boundary conductances, etc.), and unlike MODFLOWP the documentation is actually comprehensible and the code does a good job of diagnosing problems itself. Because it is model independent I anticipate using PEST extensively in the future with SWIFT II, TOUGH2 (even though ITOUGH2 exists), etc. Finally, a friend and I have modified the BCF3 package to incorporate variable anisotropy (rather than layer by layer anisotropy) and the code and documentation has been accepted by GROUNDWATER, and will be available sometime this Fall (I guess). firstname.lastname@example.org