Again, thanks Fish. I just got the news that it would cost upwards of $18,000 to build a 10' wide core in my pond dam. That is certainly more than I want to/can spend now as I am in the final stages of building a new home. I had read on this site that some are building cores of only 2' wide; maybe Mike Otto again?
By my reckoning, it doesn't seem important how wide a a core is if it is impermeable. A cereal bowl is pretty thin and it holds milk.
This concept was new to the pond builder who showed up to consult me this morning, but he found it intriguing. He felt that it should be at least 5' wide to allow for proper compaction. He didn't feel like the pond bottom was much of a problem, only the dam. I hope he is right. I'd hate to keep dumping large sums of money in a literal hole in the ground.
