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MT3D errors


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I am using MODFLOW and MT3DMS, through the LMT package, to model contaminant transport. I am encountering a persistent error when I run MT3DMS:

Invalid LOGICAL input (unit= 1).

Error occurs at or near line 474 of _btn5rp_

Called from or near line 269 of _MAIN__

What suggestions do you have to diagnose/fix this problem?

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  • 1 month later...


First, I recommend you update to the latest version and build of GMS. (see our downloads page)

Next, select "MT3D | Model Checker" if you haven't already to verify that there are no errors in your model.

Also, if there were any errors when you ran MODFLOW, you should look into that first.



XMS Technical Support

(801) 691-5530


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