link between bottom inflow and multilayer wells

Hello Feflow community,

I hope you can help me with this problem:
I would like to use the parameter expression for the inflow from the bottom of my transient model and link this inflow with the total extraction volume of the multilayer wells. The inflow on a certain selected area shall be 70% of the extraction volume.
Thus the expression would be:
inflow from the bottom = 0.7 * total volume multilayer wells (for a certain selected area)

How do I implement this expression?

Thanks in advance for your help!
Regards
Lisa

What kind of Boundary Condition did you assign at the bottom of your model to represent the inflow?

I did not assign a BC, only a time dependent value at the material property "In/outflow on top/bottom".

If you do not use any constraints imposed on the wells I assume you a priori the total amount of water over time to be extracted. To pre-process you data I suggest to generate a new time-series representing the total amount of water. Then you may consider the time-series in your expression and multiply it by 0.7. Alternatively, you could make the multiplication during the preparation of the time-series. In the latter case you do not need any expression.