All,
I have been trying to use the observation process in SEAWAT 2000.
The model runs fine, but I do not get anything meaningful from the
observation process output files. I have checked to see if it is my
OBS or HOB input files by running the model in MODFLOW 2000 which
results in meaningful output files. I have also checked the binary
head file output by the SEAWAT model and find it to contain the
correct heads. It is just the heads that are output through the
observation process (the `*._os' file) that aren't accurate.

Has anyone encountered this problem before? Has anyone been able to
successfully use the Observation process in SEAWAT 2000? Any idea as
to what is causing the issue?

I have the Observation process set up to calculate heads at
monitoring wells during a pumping test (i.e. the model is
transient). In the `*._os' file, the first predicted head value for
any monitoring well is shown as some number not zero and all other
predicted head values for other times at the given monitoring well
are reported as zero. The same OBS and HOB file work fine when
running just MODFLOW 2000, it is when I try and run the model using
SEAWAT that this problem occurs.