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Model conversion problem

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I have a "neatly" calibrated (heads and flows) MODFLOW 2005 model.  When I try to forward run it does not converge!  I can't think of a reason for that.  When I force the forward model to converge, it shows dry cells that didn't show in the parameter estimation run.  However, when I use MODFLOW Newton, the result is the same from parameter estimation and forward runs.

  1. What could the reason be for the non-convergence of the MODFLOW 2005 forward run?
  2. What is the reason for differing results between the MODFLOW 2005 parameter estimation and forward run (head and dry cells)?

I'll be appreciative for any thoughts.




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