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Camera Inspection Use Case: Dewatered Well

Questions and AnswersCamera Inspection Use Case: Dewatered Well
Admin Staff asked 10 months ago

1 Answers
Admin Staff answered 10 months ago

In West Virginia, many borewells were reported to have partially to completely dewatered due to underlying mining. But the underground operation was first mining & there was no removal of secondary pillars. Most wells were working since several years with no issues. The wells were all located in a narrow steep-sided stream valley. So a borewell camera was used on a significant number and the images showed iron staining. During investigation from the upper limit of extensive iron, it was found out that there were cases of casing corrosion in several wells. Most wells has iron concentration of iron exceeding 1.0 mg/L which is above threshold value for iron precipitation and staining.
 
The observed water level for wells was determined to be between 14 and 24 feet lower. Average water level over time was found out by location & amount of staining or corrosion. There were several wells affected which shows there were widespread change in water table. Observing this phenomenon in several wells, it is strong evidence that there has been a widespread change in the water table due to mining activities. 

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