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Line 6: − They are composed of perforated [[pipes]] installed in gently sloping granular stone beds, lined with [[Geotextiles|geotextile]] fabric. + + + + + + + + +
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Exfiltration systems can be thought of as linear soakaways; designed for both conveyance and [[infiltration]] of excess stormwater.
Exfiltration systems can be thought of as linear soakaways; designed for both conveyance and [[infiltration]] of excess stormwater.
By attenuating runoff volume, they reduce contaminant loads delivered to downstream BMPs, end-of-pipe facilities or receiving waterbodies.
By attenuating runoff volume, they reduce contaminant loads delivered to downstream BMPs, end-of-pipe facilities or receiving waterbodies.
{{textbox|Rainwater harvesting is an ideal technology for:
*Road retrofits where sewer lines are being replaced,
*All new road/storm sewer constructions where no constraints to infiltration exist,
*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:'''
*perforated [[pipes]] connected to manholes and catchabasins,
*a gently sloping granular [[reservoir aggregate| reservoir]].
'''An additional components is:'''
*[[Geotextile]] to prevent migration of fines into the reservoir.
Exfiltration systems can be used in place of conventional storm sewer pipes, where topography, water table depth, and [[water quality]] conditions are suitable. They are suitable for treating runoff from roofs, walkways, parking lots and low to medium traffic roads, with adequate [[pretreatment]].
Exfiltration systems can be used in place of conventional storm sewer pipes, where topography, water table depth, and [[water quality]] conditions are suitable. They are suitable for treating runoff from roofs, walkways, parking lots and low to medium traffic roads, with adequate [[pretreatment]].