"Drew Cutter" wrote in message
...
Are you edge's straight or angle ? supposedly angle edges are suppose to
prevent caving in.

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It had to be vertical, when I dug the original pond I chose a bad spot,
because buried behind the pond and below the trees is rock. go to
http://www3.sympatico.ca/b1wmah56 its the back wall of the pond. what
jappened in my case was that as the soil slumped at the top, it slid down
the rock and pushed the liner into the pond at the bottom.
ANO