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6 Feb ’14
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http://www.pbs.org/w.....holes.html
Program Description
In a leafy suburb near Tampa, Florida, on February 28, 2013, a giant hole opened up under the bedroom floor of Jeffrey Bush, swallowing him as he slept. His body was never found. Bush was a victim of a sinkhole—a worldwide hazard that lurks wherever limestone and other water-soluble rocks underpin the soil. When carbon dioxide from the air
Karst stood out as a key component to Sinkholes. A simple solution to avoid sinkholes would be to avoid Karst.
Karst is rock that has been carved by water flowing through it. Usually it is limestone but it can also be other types of rock, like marble. Because of the way that the rock is carved (with big spaces that allow for water to continue flowing through it), much of the water that we drink in the U.S. comes from karst aquifers (underground water supplies stored in the spaces in the rock).
Underneath Florida: A vast network of underwater caves.
15 Feb ’12
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after our sinkhole last spring, we are very careful where we stack our snow this winter, it's the only thing we could figure out
4 Mar ’12
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The End Of Florida
"The Creator made it so that Florida was shaped like the nose of a deer. One of these days soon the Creator will break the nose off the deer. Florida will break off and fall into the sea. Yes, you watch, it will happen. The time is just about here. Nothing can stop it."
And what will happen to the people of Florida? He smiled darkly, rocking in his chair.
"All dead," he says. "All be dead."
---Buffalo Jim, Seminole Wisdom Keeper
4 Mar ’12
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these sink holes are the real deal down here.
4 Mar ’12
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KVR said
after our sinkhole last spring, we are very careful where we stack our snow this winter, it's the only thing we could figure out
I know you had the driveway guys fill this up. any signs of it happening again?
15 Feb ’12
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we had no issues this summer, they think it was due to the amount of snow trying to melt and the ground still being frozen, it had no way to percolate, so we had an excavator come in and move all the snow, we have like a 20 foot pile going so far
I want to jump it with the snowmobile, but my wife won't let me 
6 Feb ’14
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KVR said
after our sinkhole last spring, we are very careful where we stack our snow this winter, it's the only thing we could figure out
Watch the NOVA program. It might give a better idea as to the cause. If I recall, trying to fill your sinkhole, it kept eating what you fed into it taking far more fill material than you expected. This would be consistent with the models of large underground void spaces covered in the program.
If you've never looked into it, you can look at the maps from the Maine Geological Survey to see which formation each of your properties are a part of. Once you know that, you can read descriptions of their compositions. If you are over Limestone (Karst), it would be a possible explanation. Here is a direct link to the pdf of the full size map. Also, the two maps I linked to in the first post of this thread show an overview.
Based on what I learned from the NOVA program, if it is a Karst issue, then the cause of your sinkhole is far larger than a mound of snow or the boundaries of your property. The contributing factors could be all around you for miles.
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