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{{float right|[[File:Perf pipe resize small.gif|417 × 194 px|Exfiltration trench under high flow and exfiltration conditions]]}}

File:Exfitlration .gif|thumb|600px|Typical flow pathway through one section of the Etobicoke Exfiltration system (see performance report for further details) For more details click [https://sustainabletechnologies.ca/app/uploads/2013/03/Exfil_ES.pdf here.] <span style="color:red">''A note: The following is an "image map", feel free to explore the image with your cursor and click on highlighted labels that appear to take you to corresponding pages on the Wiki.''</span>

 

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Exfiltration trenches are similar to [[infiltration trenches]] but differ primarily in the the manner in which stormwater is delivered to the trench.<br>

Exfiltration trenches are similar to [[infiltration trenches]] but differ primarily in the the manner in which stormwater is delivered to the trench.<br>

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]].

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]].

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==Overview==

==Overview==

Exfiltration systems can be thought of as infiltration trenches that are integrated with conventional stormwater conveyance systems (i.e. catch basins, solid pipes and maintenance holes), designed for both conveyance and [[infiltration]] of excess stormwater.

Exfiltration systems can be thought of as infiltration trenches that are integrated with conventional stormwater conveyance systems (i.e. catch basins, solid pipes and maintenance holes), designed for both conveyance and [[infiltration]] of excess stormwater.

*All new road/storm sewer constructions where no constraints to infiltration exist,  

*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.}}

*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:'''

*[[pretreatment| pre-treatment devices]] to retain coarse sediment, trash, debris and floatables,

*[[pretreatment| pre-treatment devices]] to retain coarse sediment, trash, debris and floatables,

*[[Geotextile]] to prevent migration of fines into the reservoir;

*[[Geotextile]] to prevent migration of fines into the reservoir;

*Trench plugs to help disperse stormwater throughout the trench and enhance infiltration; and

*Trench plugs to help disperse stormwater throughout the trench and enhance infiltration; and

*Perforated maintenance hole or catch basin risers.  

*Perforated maintenance hole or catch basin risers.

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]].  

==Gallery==

==Gallery==

{{:Exfiltration:_Gallery}}

{{:Exfiltration:_Gallery}}

==Materials==

==Materials==

{{:Reservoir aggregate}}

{{:Reservoir aggregate}}