Over the 18 years we've lived here, there are several sinkholes which we've noted. Two were out in one of the goat paddocks, and both have eroded in and closed themselves off. One opened in the same paddock, but was more of a chimney to a subterranian creek; that one is fenced off so the livestock don't get too close. There are two others in the 20 acre east pasture area, and those were both marked with PVC tubing; in both places, there's now a PVC staff sticking out of the ground as those spots also proceeded to fill themselves in.
We've got a sinkhole in what we call the "parking lot." Something between 10 - 12 years ago, Ruthie called me at work one day: "Was there a hole in the parking lot when you left this morning?"
Me: No, why, is there one now?
R: Yes, right where the van was parked.
I'd not felt it, so it hadn't opened up when I drove away. Probably not long after that, though, and possibly because of me driving away. It was around a meter and a half in diameter (5 feet or so), and only a few feet deep. We marked it off with a saw-horse fence so people wouldn't drive into it. It's near a low spot in that area of the property, and water runs there during big storms. Like last night; with heavy rain like last night a small, shallow pool often forms there, even with the depression that the original hole became as the edges eroded in and we added limerock stones and other organics to help fill and stablalize. Seeing a pool that covers a 5 meter/15 foot diameter, with that hole inside it, means a lot of standing water, and I drove wide going around it when we pulled out last night to go visit friends.
This morning, it is definitely at, no it is the low spot, and enlarged to about 10 by 6 feet (3 by 2 meters) and nearly two meters deep. I can see one of the several saw horses that used to make the fence. Ruthann asked if I was going to go after it, and I replied most emphatically, "No." So whatever chimney or cavern is under that zone collapsed some more from the weight of sodden earth on top of it. So now we've got to mark off a larger zone with fencing, and possibly look to re-routing our drive road away from that as much as possible.
It's nowhere near any any of the houses; the nearest structure is a storage shed and it's 60-70 feet away.
We are not bored.