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Tunnels open to the surface DO flood!

 
Rainwater flowing down a cow path had entered a ground squirrel burrow, flowed downhill, and washed away soil from the sides of the tunnel. This subsurface erosion continued until the top of a now large tunnel caved in. Once the top is gone, the next few rains convert it into a gully, obscuring the real cause — subsurface erosion.
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206-tunnel-erode

 

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