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Garabage truck in sink hole Allentown, Pa.
YouTube ^ | 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.)
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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
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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
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To: bgill
on the square piece of cement

Cement is a fine gray powder. Do you also say 'flour' when you mean 'cake'?

24 posted on 02/21/2017 8:04:00 AM PST by FirstFlaBn
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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.


25 posted on 02/21/2017 8:11:17 AM PST by Flavious_Maximus
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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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