Thanks for your response Peter.

We have had no success with the MODFLOW Lake package - it just seems
to create numerical instability.

Regards

Brian

--- In feflow@..., Pete Sinton <psinton@...> wrote:
>
> I've modeled underground voids and lakes in FEFLOW using the method
you
> describe. I know of no better approach in FEFLOW. There are
modules
> for MODFLOW that could be adapted using the IFM.
>
> These references may useful:
>
> Anderson, M.P., R.J. Hunt, J.T. Krohelski, and K. Chung. 2002.
Using
> high hydraulic conductivity nodes to simulate seepage lakes. Ground
> Water 40, no. 2: 119-124.
>
> Cheng, X., and M.P. Anderson. 1993. Numerical simulation of ground-
water
> interaction with lakes allowing for fluctuating lake levels. Ground
> Water 31, no. 6: 929-933.
>
> The large-K/Sy=1 approach seems to work as well as the fancy lake
> packages developed for MODFLOW and other models.
>
> Pete
>
> bbarnett40 wrote:
> >
> > Has anyone had experience in using FEFLOW to calculate water
levels in
> > surface water bodies?
> >
> > Usually surface water bodies are included in groundwater models
as head
> > dependent boundary conditions. In other words the water levels in
lakes
> > or ponds are specified in the model input. However in many
instances
> > it would be useful to use the model to caluclate the water levels
in
> > the lake, pond or void. In the past we have addressed this
problem by
> > including the size and shape of void in the model grid structure
and
> > defined hydraulic parameters representative of a surface water
body (ie
> > extremely high hydraulic conductivity, storage of 1.0 and recharge
> > defined as the excess of rainfall over evaporation) to the volume
of
> > the void.
> >
> > Is there a more sophisticated solution available in FEFLOW?
> >
> > Cheers
>