Allegheny Instruments, Inc.

Bottom-hole Karst Conduit in Water Well - Craig County, Virginia Video

This video shows a moderately sized water-filled karst conduit in a 6' diameter former supply well in Craig County, Virginia. The well is currently the only real-time state observation well for Craig County http://waterdata.usgs.gov/va/nwis/uv/?site_no=372223080234801&PARAmeter_cd=72019,72020. The well is drilled in Ordovician Knox Group carbonate bedrock and shows the complex nature of conduit formation in this area. The well cap had been damaged by a bushhog prior to its incorporation into the observation network and sat with a very small opening (~1/4') for several years. Apparently, that was all it took to entice several generations of rodents to crawl in and fall to their death, slowly decompose and gently fall through the water column to a common resting place. Also note the large amount of fine silt in this conduit which would cause turbidity problems. The video was recorded by DEQ Groundwater Characterization staff on 8/6/09. http://www.deq.virginia.gov/gwcharacterization/homepage.html

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