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Infiltration trenches

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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>
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]].
[[File:Infiltration Kortright trench.pngPNG|thumb|Schematic diagram 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 an underground infiltration trenchoccasional maintenance task. For more details click [https://sustainabletechnologies.ca/app/uploads/2016/08/BioVSTrench_TechBrief__July2015.pdf here] ]]
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==Overview==
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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.
{{bextboxtextbox|1=Infiltration trenches are an ideal technology for:
*Installing below any type of surface or landscape
*Balancing the requirements to infiltrate excess stormwater whilst conveying excess}}
<strong>'''The fundamental components of an infiltration trench are:</strong> ''' *Layers of [[Reservoir_gravel|coarse aggregate]] to bed the chambers pipe, store and redistribute water.
*[[Pipes|Perforated pipe]]
*[[Geotextiles|Filter fabric a.k.a geotextileGeotextile]] 
==Planning considerations==
As shown in the illustration above a surface inlet to an infiltration trench may simply be a channel of decorative [[stone]] supported by a [[geotextile]]. So that at grade it may be indistinguishable from a [[gravel diaphragm]]. In function though, the decorative surface course of the infiltration trench needs to remain free-draining down into the trench, whereas the gravel diaphragm is designed to spill over onto adjacent land, leaving sediment behind in the [[gravel]] or [[stone]] channel.
==Design==
===Sizing===
'''[[Infiltration: Sizing and modeling]]'''*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>*"...not normally be deeper than 3 to 4 m in order to maximise the length of the flow path to the water table through the unsaturated zone." <ref>Design of soakaways (2015) www.tiipublications.ie/library/DN-DNG-03072-01.pdf</ref>*There is a cost implication with digging deeper practices, trench boxes may be required to retain the side walls during construction.
==Materials==
===Aggregate===
{{:GravelReservoir aggregate}} 
===Perforated Pipe===
{{:Pipes}}
==Construction==
{{:Infiltration: *[[Construction}}]] 
==Gallery==
{{:Infiltration trenches: Gallery}}
==Incentives and Credits=====In Ontario======LEED BD + C v. 4==={{:LEED: Rainwater management}}===SITES v.2===----
[[category:infiltration]]

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