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The liner is in two pieces.
One is the main pond. The other is the upper reservoir and falls...all one piece. They overlap each other entirely, with geotex underneath. I went around it tonight...every perimeter inch. I've got the water level at least an inch, inch and a half below everywhere, esp around the drop points. Will check everything out again tomorrow though.
Good suggestion re unplugging it and checking drainage in the skimmer box and biofalls. The h/o built a deck overtop the biofalls, but if we have to unscrew a few boards off, so be it. I did put a check valve on it. I can't isolate the pump because of how it's plumbed, unfortunately. There's a fair bit of spash action, but it's contained in the liner field. I'll double check the drop points into the pond though, per natural12
I siliconed all the fittings...
Thanks for all your responses guys. This one's pretty well built, so I'm a bit stumped on this. I found a few wet spots on the mulch, two in particular...one was a minor low spot; the other was constant capillary action which was wicking water out. I can tell there was some water loss because of the different rate of Japanese bloodgrass growth....
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