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A good drainage ditch is rounded or flat on the bottom. The sides of the ditch should have a slope as seen in this first photo. A filter fabric is placed in the ditch. This protects the ground and prevents vegetation from growing through the rocks.

   
     
   
     
   
     
   

Rocks are placed into the ditch, building in layers and ensuring that larger rocks are lower than smaller ones in the ditch.

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