Knox County Sinkhole, TN

East Tennessee’s karst terrain is perfect for sinkholes. It has soluble limestone bedrock that dissolves, creating underground systems. This area is part of the Appalachian karst belt, from Alabama to Virginia.

A 1973 USGS geological survey by Larry Harris mapped these rocks. His work showed a lot of limestone under Knox and Anderson counties. Today, researchers use LiDAR imaging to build on his findings.

In 2019, University of Tennessee scientists looked at a 14-square-mile area near Dutchtown. They used LiDAR scans with 1.3-ft precision to find 278 subsidence features. This technology shows hidden ground dangers that old surveys can’t see.

Now, they watch the ground and water with satellite data and sensors. This helps officials know if buildings are safe in unstable areas.

Recent & Notable Sinkhole Incidents / Case Studies

Knox County’s systems have found 127 underground holes from 2003 to now. Most of these were in areas thought to be safe. New maps show a 42% increase in areas at risk, mainly near Powell River.

The 2019 Dutchtown LiDAR study was a big step forward. It used laser scans to find 19 hidden holes under homes. This method helps plan better for Tennessee’s karst areas.

Important findings from Knox County include:

• Roadway repair costs averaging $87,500 per incident (2015-2022 data)
• 12% of drainage system failures linked to underlying karst activity
• Utility pipeline damage occurring 3.2x more frequently in high-risk zones

New tools like ground-penetrating radar help predict sinkholes. They were used in 2021 to protect 14 businesses in Fountain City. Before 2010, 38% of active sinkholes were missed.

Researchers are studying how water levels change sinkholes. Geologists in Knox County check the ground every year. They focus on areas near known karst incidents, like those on Knox Dolomite.

Risk Factors & What Homeowners Should Do

Knox County TN sinkhole risks need careful planning based on solid geological data. Homeowners should first check any ground depressions by calling EPW Operations at 865-215-5800 or emailing epw-operations@knoxcounty.org. This helps to see if it’s a utility problem. Municipal teams usually check within 48 hours to find out if it’s related to infrastructure.

Geotechnical tests are needed if you see circular plants or sudden soil sinking. The Knox County sinkhole map helps with risk checks. But, a detailed check by a licensed engineer is more accurate.

EPW Operations suggests checking your foundation every three months and extending downspouts if you live near limestone. If you see big cracks or doors that don’t fit right, get a pro to look at it fast. Most insurance in Tennessee now asks for these checks to cover sinkholes fully.

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