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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:'''
−*perforated [[pipes]] connected to manholes and catchabasins,
+*pre-treatment devices to retain coarse sediment, trash, debris and floatables,
−*a gently sloping granular [[reservoir aggregate| reservoir]].
+*perforated [[pipes]] connected to maintenance holes and catch basins,
−'''An additional components is:'''
+*a gently sloping granular [[reservoir aggregate| storage reservoir]] below the perforated pipe.
+'''Optional components include:'''
*[[Geotextile]] to prevent migration of fines into the reservoir.
*[[Geotextile]] to prevent migration of fines into the reservoir.