Hi all - new user here.

I have a leaking pond - here's the net.

Pond was dug 2 years ago - but never filled - It is oval in shape app 150' x 120' x 18' deep at its deepest.

After 1st winter contractor told me he 'hit shale'...so...

Last summer I found a different contractor - he lined the bottom of the pond (lower 1/3) with plastic sheeting - 6 mil stuff - overlapped it by 4-5' or so - it came in 20x120' rolls. They placed app 10 loads (15cu yds/load) of good blue clay on top and the sides - including the dam. This past winter the pond was app 1/2 full - but water level would fluctuate by 2' or more after a rain - it would just slowly seep out.

So...this spring - we drained it & lined the WHOLE pond again with more blue clay. Same result - water is just slowly leaking out - but it retains water close to the old plastic liner originally put in there...

Any ideas on what I can do next?

How would I locate a leak like this - there is nothing obvious on the dam side - no obvious leaks at all.

signed,

//puzzled in WNY state