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More tunnel erosion

On a hillside when rainwater running down a livestock trail or road gets channeled down an opening to a pocket gopher or ground squirrel burrow, it causes extensive subsurface erosion in some types of soil. This produces large tunnels that later cave in and become gullies.
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223-tunnel-erosion

 

photo by Howdy Howard, published in Saved by Bedbugs (2004)
 
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