If the aquitard is at the top of the model and does not allow any water
to go through it at all, as suggested by your setting the vertical
hydraulic conductivity to zero, than you don't need to include it in the
model. By default, all the external boundaries of a MODFLOW model are
no-flow boundaries. If the aquitard does allow some water to go through
it, the vertical hydraulic conductivity and initial head need to be
If you have further questions about the usage of the MODFLOW GUI in
Argus ONE, you can send them to me at rbwinst@...
> I am a new user of Argus ONE. I would highly appreciate it if you could
> help me with the following question:
> How to describe aquitard in Argus ONE;
> I need to simulate a aquitard(top layer) and a confined aquifer (bottom
> layer). In Geology Tab, I defined the aquitard as confined (0), In the
> respective information layer of the aquitard, I defined hydraulic
> conductivity Kx=Kz=0. But once I run the model, a warning saying that
> vertical conductance< or=0 appeared. Also,I have problem with the
> initial head. For the aquitard, I don't think I need to specify the
> initial head. However, then a warning saying that the initial head of
> the first layer is lower than the bottom of the first layer appeared.
> When I assign values to K and initial head, the model runs properly but
> that doesn't represent the real physics in my case. So, could you pls
> pls explain how to simulate an aquitard layer (aquifer type, K, initial
> head, specific storage, et al.). Thanks in advance!