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constant concentration and source/sink


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Hello everybody

I have a SEAWAT problem with MODFLOW/MT3DMS. Flow model works fine but MT3DMS prompts error message requiring to use sink/source term. I have no wells in the problem and the only BC are constant concentrations at both sides of the boundary. Why I need to specify sink/source terms? 

In this case do I need to specify negative values of ICBUND array at constant concentration cells?


Thanks for help


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  • 1 month later...

Hi speedy,

it seems you need to enable the MT3DMS SSM package to enable the mixing of fluid coming from the constant conc. BCs. I would try to enable SSM and set ICBUND to -1. It should work then.

Hope it helps.


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