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constant concentration and source/sink


speedy
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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

Speedy

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