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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==