There's gotta be a seam of permiable dirt in there beneath the high water level. It might be a vein of sand, etc.

If you do a bucket test with the dirt from the pond bottom, and it holds water, that will mean that there's at least one area that has different dirt, and that's probably where it's leaking.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).