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Hey there, I am trying to generate transient model in order to test if there are potential leakages through the barrier. We have boundary conditions on two sides. Left of the barrier there is a river and right of the barrier I am using CHD boundary condition. The whole layer is considered to be gravel with K of 0.001 m/s. On the left side of the barrier there is as well an injection well into which we put NaCl at the time of 7200 s in concentration of 1200 mg/L. Right of the barrier we have a pumping well where we pump at ration 6l/s, starting from time 0 s. The whole experiment lasts until 21600 s. MODFLOW is working perfectly with the boundary conditions and we are able to see expected draw down because of the pumping well. I have set specific storage, specific yield, stress periods, concentrations but noting happens when I rund the MT3D model. Is there maybe and easy solution to this? Maye someone can point to me what should I look in to? Best regards, Urban