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*Tight urban spaces where no landscaped practices can be squeezed in, and there is a low risk tolerance for flooding.}}
 
*Tight urban spaces where no landscaped practices can be squeezed in, and there is a low risk tolerance for flooding.}}
 
'''The fundamental components of an exfiltration system are:'''
 
'''The fundamental components of an exfiltration system are:'''
*pre-treatment devices to retain coarse sediment, trash, debris and floatables,
+
*[[pre-treatment| pre-treatment devices]] to retain coarse sediment, trash, debris and floatables,
 
*perforated [[pipes]] connected to maintenance holes and catch basins,
 
*perforated [[pipes]] connected to maintenance holes and catch basins,
 
*a gently sloping granular [[reservoir aggregate| storage reservoir]] below the perforated pipe.  
 
*a gently sloping granular [[reservoir aggregate| storage reservoir]] below the perforated pipe.  

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