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==Overview==
Exfiltration trenches are similar to [[infiltration trenches]] but differs primarily in the the manner in which surface runoff is delivered to the trench. Runoff enters infiltration trenches directly by infiltration from the surface. In exfiltration systems, surface runoff is collected by drainage inlets and delivered to the trench via subsurface perforated pipes.
https://www.chijournal.org/C390
https://www.chijournal.org/C390