""because of the type of clay? Or the way its is compacted?"" Both reasons, plus the time of year. IMO if the compacted sides go through a few freeze-thaw cycles before the pond is full this tends to loosen and break apart materials where ever water has infiltrated. Freezing & thawing apparently a powerful separating affect. Look at what is does to our northern highways both asphalt and cement.
Last edited by Bill Cody; 01/22/15 11:22 AM.
