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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]].  
[[Perforated catchbasins| Perforated catch basins and maintenance holes]] are a design variation, where the riser is perforated to allow runoff to infiltrate into the underlying soil.  
Perforated catch basins and maintenance holes are a design variation, where the riser is perforated to allow runoff to infiltrate into the underlying soil.  
Exfiltration systems can also be referred to as perforated pipe systems, clean water collector systems and percolation drainage systems.
Exfiltration systems can also be referred to as perforated pipe systems, clean water collector systems and percolation drainage systems.


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