"Richard Holub" wrote in message
...
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I have read that if a liner pond is
constructed directly on the top of a wet land, the liner will bubble up.
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The liner being lifted can occur even for a shallow pond well above the
freeze line, if there is enough run-off. My 12 inch deep VF did exactly
this.

The best remedies for this are...

1. Landscape in such a way that run-off is diverted around the pond, and not
into or under it.
2. And for ground water, provide a way for it to escape. Simply burying a
1'' piece of PVC that runs up from the pond bottom (under the liner) and out
somewhere else, may be enough to allow the pressure to dissipate and not
lift the liner.

BV.