Different simulated head for every layer?

I run the model under steady state condition by separating the model in to 15 layers and 16 slices, thickness is about 300m. I assigned initial groundwater level, K, n, Ss and boundary condition. Now problem settings, Saturated condition, top slice as free & movable and below layers are phreatic and bottom most layer is under fixed condition. After simulation the head values for every layer is different (not uniform). I dont know how to fix this problem and where i made mistake. I would happy if some one solve this problem.

Hi,

The slices below should be indicated as "Dependent". The "free" first slice will move according to the fluctuations of the phreatic level. Here, pressure will be always zero and FEFLOW will adjust the slice elevation to fulfill the statement. The next slices are adapted to changes of free slice.
I would recommend you to take a look on White Paper I (http://www.feflow.info/manuals.html) for further details.

Cheers,

Carlos