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This article is about underground systems which distribute concentrated flow along a level, linear facility to promote infiltration to native soils. <br>

This article is about underground systems which distribute concentrated flow along a level, linear facility to promote infiltration to native soils. <br>

For a similar structure, which differs in being designed to receive excess flow and convey it, whilst promoting infiltration to native soils, see [[exfiltration trenches]].

See [[exfiltration trenches]] for guidance on infiltration trench systems integrated with conventional storm sewers and manholes that provide both infiltration and conveyance functions.  

[[File:Kortright trench.PNG|thumb|The infiltration trench at Kortright is topped with [[filter fabric]] and decorative [[stone]], both of which provide some pretreatment and can easily be removed and replaced as occasional maintenance. For more details click [https://sustainabletechnologies.ca/app/uploads/2016/08/BioVSTrench_TechBrief__July2015.pdf here] ]]   

 

[[File:Kortright trench.PNG|thumb|This infiltration trench features an inlet composed of [[geotextile| filter fabric]] and decorative [[stone| river stone]], which provides some [[pretreatment]] and can easily be removed and replaced as part of routine sediment removal maintenance. For more details click [https://sustainabletechnologies.ca/app/uploads/2016/08/BioVSTrench_TechBrief__July2015.pdf here] ]]   

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==Overview==

==Overview==

As their name suggests infiltration trenches work primarily to infiltrate and convey stormwater. They are an underground facility and are excellently suited to connecting other components in the treatment train.

As their name suggests infiltration trenches work primarily to infiltrate and convey stormwater. They are an underground facility and are excellently suited to connecting other components in the treatment train.

{{textbox|1=Infiltration trenches are an ideal technology for:  

{{textbox|1=Infiltration trenches are an ideal technology for:  

*Balancing the requirements to infiltrate excess stormwater whilst conveying excess}}

*Balancing the requirements to infiltrate excess stormwater whilst conveying excess}}

'''The fundamental components of an infiltration trench are:'''  

'''The fundamental components of an infiltration trench are:'''  

*Layers of [[Reservoir_gravel|coarse aggregate]] to bed the pipe, store and redistribute water.

*Water storage reservoir, filled with [[Reservoir_gravel|coarse aggregate]], possibly void-forming structures to minimize depth and conserve aggregate, and organic material derived from untreated wood (aids in dissolved nitrogen removal);

*[[Pipes|Perforated pipe]]  

*[[Pipes|Perforated pipes]] to deliver water to the trench and convey excess flow to a downstream storm sewer or other BMP; and

*[[Geotextile]]

*[[Geotextile]] to maintain separation between the storage reservoir and surrounding native soil.

==Planning considerations==

==Planning considerations==

==Design==

==Design==

===Sizing===

===Sizing===

Virginia up to 10' (3 m) deep. <ref>Viriginia Deprtmant of Transport. (2010). VDOT BMP Design Manual of Practice. Retrieved March 15, 2018, from http://www.virginiadot.org/business/resources/LocDes/BMP_Design-Manual/Chapter_8_Infiltration_Trench.pdf</ref>

Minnesota up to 12' (3.6 m) deep. <ref>Design criteria for Infiltration trench. (2016, September 21). Minnesota Stormwater Manual, . Retrieved 13:25, April 4, 2018 from https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_Infiltration_trench&oldid=28702.</ref>

*Virginia up to 10' (3 m) deep. <ref>Viriginia Department of Transport. (2010). VDOT BMP Design Manual of Practice. Retrieved March 15, 2018, from http://www.virginiadot.org/business/resources/LocDes/BMP_Design-Manual/Chapter_8_Infiltration_Trench.pdf</ref>

 

*Minnesota up to 12' (3.6 m) deep. <ref>Design criteria for Infiltration trench. (2016, September 21). Minnesota Stormwater Manual, . Retrieved 13:25, April 4, 2018 from https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_Infiltration_trench&oldid=28702.</ref>

==Materials==

==Materials==

==Construction==

==Construction==

{{:Infiltration: Construction}}

*[[Construction]]

 

==Gallery==

==Gallery==

{{:Infiltration trenches: Gallery}}

{{:Infiltration trenches: Gallery}}