Forchheimer Drag 1

Hi
i am doing cfd analysis for a porous media filter ,I got the answer but my flow rate is so high than the actual flow rate of the filter so then i used forchheimer drag for porous media so that i could get the flow rate but use of forchheimer drag has no change in the computation model.

Is there anything error i did in applying the drag coefficient to porous media ,please let me know i have attached a file below.
Please do meshing and compute the model

Thanks in advance
Regards