Hi Yinka
I did my masters project in artficial recharge. I used PMWIN 5 to simulate the
groundwater recharge. My study area is bound by a river in the east but there is
no defined boundary condition on other sides. Because the direction of flow is
toward the river I used constant boundary condition on the west. To avoid it's
impact on the concern area I telescoped the cells far from main area up to 500
meter. I did water balance simualition between the constant head cells and the
main area to make sure that they did not interact each other.

So you can decied your boundary condition based on your direction of flow. In
other way you have to have one constant head boundary condition in order your
excess flow to be spilled out.
I hope this will help you a bit.

yours
Yosief



I am using MODFLOW 2000 to model a three layer, 170 rows x 220 cols.
The west and east boundaries are bounded by impermeable strata.
Hence, I intend to apply no flow boundaries. However, there is no
physical or impermeable boundary at both the north and south
boundaries. Coupled with this, there are very few monitoring borehole
data within this study area and all these well records are completed
within the first top layer.Please, can someone suggest ways to handle
these north and south boundaries for the three layers? What other
data do I need to obtain?

Thanks.

Yinka.



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