This leak is driving me crazy

Some of my buckets hold and some don't
I'm going to do a few more bucket tests to see what happens

I know I have a layer of gravel under my pond
I believe it's 10' down on one side of the pond to as little as 2' down on the far side
I just dumped 4 25 ton loads of pond silt from the local stone yard
The problem is every time I do something I have to wait 6 months for a heavy rain fall to see if it's holding
At 1 " water loss a day over 3 months things get ugly fast




Pond is about 3/4 acre located in Sullivan county NY
I guess I'm going to get prices on 2' of clay delivered and spread