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*[[Plant lists|Plants]], and  
 
*[[Plant lists|Plants]], and  
 
*A filter bed surface cover layer (e.g. [[mulch]] and [[stone]])
 
*A filter bed surface cover layer (e.g. [[mulch]] and [[stone]])
*An [[Overflow| overflow outlet]]
+
*An [[Overflow| overflow outlet]] to safely convey excess flow to a downstream storm sewer or the next BMP in the treatment train.
 
'''Additional components may include:'''  
 
'''Additional components may include:'''  
 
*An [[underdrain]] to redistribute or remove excess water
 
*An [[underdrain]] to redistribute or remove excess water
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*Underdrain access structures or standpipe ports for periodic inspection and flushing
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*A monitoring well installed to the base and screened in the internal water storage reservoir to verify and track drainage performance
 
*Filter media [[additives]] intended to enhance retention of nutrients, metals, petroleum hydrocarbons and/or bacteria.
 
*Filter media [[additives]] intended to enhance retention of nutrients, metals, petroleum hydrocarbons and/or bacteria.
  

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