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*suitable vegetation,
 
*suitable vegetation,
 
*decorative aggregate or [[stone]],
 
*decorative aggregate or [[stone]],
*An [[underdrain]]
+
*An [[underdrain]],
 +
*An impermeable liner,
 
'''The design may benefit from:'''
 
'''The design may benefit from:'''
*A [[level spreaders| level spreader]]  
+
*A [[level spreaders| level spreader]]
 
      
==Planning Considerations==
 
==Planning Considerations==

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