We have a few through parts of this area, I just finished a project of building a driveway across the edge of one, A ton of red tape and dnr permits were required, as far as trying to build a pond over one, I know of a few in this area that actually hold water on their own and then most of them of course not.
If I were to try to seal one off I would start with a concrete slab of some sort to bridge across the actual opening and then a generous layer of some kind of pond liner over that, after covering the concrete slab with dirt to prevent abraision to the fabric, then proceed with layers of good fat shrink swell clay.
I had a friend who built a pond back in the day, wasnt aware of any sink hole in the area till one morning, ten years later his pond just emptied over nite, down the drain.
Again, the above is just a theory, I have not actually tried to seal water from entering a sinkhole, I was hoping some professionals with experience on the subject might chime in.
Last edited by gehajake; 05/30/20 09:20 PM.
