Dear All!
I am sorry for the last email. I have finally found the answer to my
solution. When I run the modflow model I assigned a liner gradient
along the downstream side (the equivalent freswater head), but
apparently seawat transforms the salt head in the fresh head
automatically and it is not necessary to assign a liner gradient as in
Feflow. I tried to run again the new model and the two solutions
(feflow and modflow) now match very well.
Thank you again for yoyur attention
Gio