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Old 05-14-2014, 04:38 PM
 
Location: Native Floridian, USA
4,896 posts, read 5,867,686 times
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From living here in Florida, I had understood that a big contributor to the sinkholes here were due in large part to the draw down of the water levels under this big old limestone shelf we call Florida.

Quote:
Development of these ground-water resources for municipal, industrial and agricultural
water supplies creates regional ground-water-level declines
that play a role in accelerating sinkhole formation, thereby increasing susceptibility of the aquifers to contamination from surfacewaterdrainage. http://pubs.usgs.gov/circ/circ1182/pdf/15WCFlorida.pdf
I would consider that man made
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Old 05-14-2014, 11:30 PM
 
Location: Blue Ridge
20,894 posts, read 22,686,717 times
Reputation: 8636
The city knew for decades there was a problem.
https://www.baltimorebrew.com/2014/0...to-status-quo/

And from this link, its pretty easy to tell that the city simply paved over the brick and did nothing to reinforce the road for increased traffic.

Baltimore City Infrastructure A Huge Concern After 26th Street Collapse CBS Baltimore
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Old 05-22-2014, 03:16 PM
MJ7
 
6,221 posts, read 8,199,546 times
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Quote:
Originally Posted by P47P47 View Post
Really? More of those than of the natural erosion of limestone below the soil type? That's surprising to me. Could it be that there are more of the man-made variety, but that they tend to be of a less catastrophic nature than the natural ones?
Yes, they are less catastrophic because they occur around water mains and other trenches, they aren't as large as natural limestone dissolution due to physical (vegetation) and chemical (water) erosion.

Quote:
Originally Posted by Simtropico View Post
Usually the result of too much construction work?
Utility engineering, placing water mains, or telecommunication lines in the ground with trenches, etc.

Quote:
Originally Posted by Darthfrodo View Post
Man made ones are most often caused by a water main, or sewage line break, although they do commonly occur when poor construction methods are used.

I am curious though where he got his information that most are man made? Certainly not the case in Florida and Minnesota, where they are caused by subterranean erosion of limestone.

I recall hearing once that there's a single county in MN with over 10,000 sinkholes in it.
MN is the land of 10,000 lakes, they have some limestone, but not many sinkholes. FL on the other hand has sinkholes, however, the man-made sinkholes are more prevalent.

Quote:
Originally Posted by AnnieA View Post
From living here in Florida, I had understood that a big contributor to the sinkholes here were due in large part to the draw down of the water levels under this big old limestone shelf we call Florida.



I would consider that man made
This is true, it depends on the location. Near Plant City it occurred with the strawberry farms.
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Old 05-27-2014, 06:49 PM
 
Location: Gulf Coast Texas
26,212 posts, read 14,100,551 times
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City Tallies Cost for Street Collapse Repairs

The department said Tuesday it has received approval for an $18.5 million allotment from the city's finance department to go toward installing a temporary retaining wall, constructing a permanent wall and engineering costs. The original wall that collapsed was owned by freight company CSX Corp.

The city says it is in discussions with CSX for help footing the $18.5 million cost of repairs.



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