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Garabage truck in sink hole Allentown, Pa.
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| 2-21-17
| JR
Posted on 02/21/2017 6:05:01 AM PST by Trumpnation
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To: Fresh Wind
Because of Sen. KKK Byrd West Virginia has the best roads in the USA.
21
posted on
02/21/2017 7:56:10 AM PST
by
central_va
(I won't be reconstructed and I do not give a damn.)
To: dangus
From wfmz.com
“ALLENTOWN, Pa. - A sinkhole has reportedly opened up at 12th and Highland streets in Allentown.”
22
posted on
02/21/2017 7:56:18 AM PST
by
fatboy
To: riverrunner; WinMod70
Recurring water main leak is my guess as well.
23
posted on
02/21/2017 8:00:08 AM PST
by
Oratam
To: bgill
on the square piece of cement Cement is a fine gray powder. Do you also say 'flour' when you mean 'cake'?
To: Trumpnation
In Allentown, sometime around 1994, an entire 9 story building got swallowed up by a huge sink hole.
The building had just been completed and was supposed to be the flagship project for revitalizing the cities downtown business.
Needless, to say, the new building had to be demolished before they even had any tenants.
To: Fresh Wind
IN fairness, that "pothole" is 48 feet wide and 38 feet deep and thousands of years old.
Here's the thing:
Sand washing away under a road surface, causing that road surface to collapse is not a sinkhole; it's a pothole.
A sinkhole is what happens over thousands of years as an aquifer dissolves away limestone, and then the area above the dissolved limestone collapses. It's not a "cave collapse" because commonly there is no cave; the collapse happens when the aquifer's water level drops, and the structire of the limestone above is no longer aided by the bouyancy the aquifer's water provides.
How did the two terms get confused? When florida's aquifer was being overused starting in the 1980s, actual sinkholes started appearing in the developed areas that were withdrawing the aquifer's water.
"Natural" sinkhole:
Florida sinkhole:
Pothole:
Pennsylvania's great Natural pothole, formed by glacial erosion, not by dissolution of limestone:
26
posted on
02/21/2017 9:06:11 AM PST
by
dangus
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