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Line 1: [[File:Exfilt syst.png|thumb|400px|A schematic of a standard exfiltration system integrated with conventional stormwater conveyance systems (catch basins, stormwater pipes and pipes and maintenance/manholes).]]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]].{{TOClimit|2}}==Overview==Line 20:
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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>
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>
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]].
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==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.
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.
*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.}}
[[File:Exfilt syst.png|thumb|500px|A schematic of a standard exfiltration system integrated with conventional stormwater conveyance systems (catch basins, stormwater pipes and pipes and maintenance/manholes).]]
Take a look at the downloadable Exfiltration Trench Systems Factsheet below for a .pdf overview of this LID Best Management Practice:
Take a look at the downloadable Exfiltration Trench Systems Factsheet below for a .pdf overview of this LID Best Management Practice:
{{Clickable button|[[File:Exfiltration.png|150 px|link=https://wiki.sustainabletechnologies.ca/images/4/4e/Exfiltration_systems_final.pdf]]}}
{{Clickable button|[[File:Exfiltration.png|150px|link=https://wiki.sustainabletechnologies.ca/images/4/4e/Exfiltration_systems_final.pdf]]}}
*[[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]].