Check out Caine and Forster 1999, caine et al 1996, smith et al 1990.
Barrier versus conduit determination are dependant on the rock type,
fault orientation, structural regiem, and infilling.

I use FEMWATER to buld gw models with faults having irregular
geometries. Packer test data from boreholes drilled into faults are
used to bound the fault K values and sens analysis.


--- In gms-users@..., Tim Hazlett <hydromodeler@...>
wrote:
>
> There's a seminal paper on fault flow in the Bighorn Basin (USA) by
Bredehoeft from the 1980's.
>
> He used MODFLOW if I recall.
>
> The real decision you need to make here is whether they are acting as
barriers against or conduits for flow.
>
> I suggest a sensitivity analyses as well.
>
> Regards
> Tim
>