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# wrbanwrban

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1. ## boundary conditions Determing boundary condition

Hey all! I have a question regarding boundary condition set up. I am working on a regional model of an large aquifer field which is used for drinking water purposes. Hydrologic and hydrogeologic conditions are at this stage of the research verry clear. We are dealing with open aquifer field where boundary condition is representing inflow to the aquifer from surrounding sedimentary formations. We have calculated the infow using National groundwater recharge model and at this stage we have data of infow (Q [m^3/s]) for every cell of the boundary condition. Is it possible to calculate the needed hydraulic head in order to simulate the boundary conditions as constant head?
2. ## MT3D-NaCl barrier tessting

Hey, thanx for replying! sorry for being unspecific. It is like you said, the tracer concentration is always zero. I have checked all the potential problems that you mentioned but still, the problem is there. I attached a picture of the model, if maybe that helps someone with an idea... Thanx again!!
3. ## MT3D-NaCl barrier tessting

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
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