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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>

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===Overview===

==Overview==

<p>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.</p>

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

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:  

*Installing below any type of surface or landscape

*Installing below any type of surface or landscape

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

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

    <p><strong>The fundamental components of an infiltration trench are:</strong>

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

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

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

*[[Pipes|Perforated pipe]]  

*[[Pipes|Perforated pipe]]  

*[[Geotextiles|Filter fabric a.k.a geotextile]]

*[[Geotextile]]

 

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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.

 

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Infiltration trench.png| Schematic diagram of an underground infiltration trench

===Sizing===

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'''[[Infiltration: Sizing and modeling]]'''

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*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>

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*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>

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*"...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>

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===Design===

===Perforated Pipe===

{{:Pipes}}

===Materials===

{{:Gravel}}

*[[Geotextiles]]

*[[Geotextiles]]

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[[category:infiltration]]

[[category:infiltration]]