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Friends of the
North Fork & White River


Caring For Karst

UNDERSTANDING OUR WATERSHED AND LEARNING TO PROTECT IT. 
 

What is Karst and What Does It Mean to Our Geography?

The Ozark region is a karst topography characterized by sinkholes, caves, underground streams and aquifers that supply our wells and springs. Sinkholes – natural surface depressions or drainage points – serve to conduct surface water to underground passages. The comparatively rapid transmission of groundwater flow through sinkholes in karst provides little opportunity for natural filtering or other purifying effects. As a result, surface pollutants rapidly enter our ground water polluting our wells and springs.

 

What You Can Do To Protect Karst

Minimize Land Disturbance

The extraction of rocks, soil, vegetation and water will clearly interrupt the processes that produce and maintain karst. Such uses should be carefully planned and executed to minimize environmental impact.

Protect Sinkholes

  • Ensure that sinkholes are marked and secured with fence, rope or taped very clearly.
  • Check carefully for signs of the sinkhole enlarging, especially toward buildings, septic tanks, drain fields, and wells (flowing water into a sinkhole will continue or accelerate its growth). This can be done by pushing a thinhard metal rod into the soil. Areas near the sink will offer less resistance to the rod than the unaffected soil.
  • Do not throw any waste into a sinkhole or use it as a drainage system. Pesticides and other wastes seep easily through the sinkhole into the aquifer – your drinking water.
  • Stabilize a sinkhole if it is a hazard to health and safety.
  • Contact a specialist such as your county extension office or state experts. (see our links)
  • Create a vegetated zone. A 100 foot wide grass filter strip is ideal. A wide natural buffer of trees and understory vegetation around sinkholes is more effective in removing sediment from deeper sinkholes and holes located in gullies or ravines.

Protect Well Water

  • Situate wells away from barns, feed lots, livestock pens, sinkholes, dumps, septic systems and fuel tanks to keep polluted surface water out.
  • Line well with welded steel pipe, grouted in place.
  • Keep fertilizer, pesticides, petroleum products and other chemicals away from zone around wells.
  • Keep standing water from accumulating around wells.
  • Check your water at the County Health Unit.

PO Box 61
Mountain Home AR, 72654

Phone: 870-430-5777 ~ Jane Darr
Email: RiverFriend@FriendsOfTheRivers.org
Website: http://www.FriendsOfTheRivers.org/