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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]]. | | 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 trench.png|thumb|Schematic diagram of an underground infiltration trench]] | + | [[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 an occasional maintenance task. For more details click [https://sustainabletechnologies.ca/app/uploads/2016/08/BioVSTrench_TechBrief__July2015.pdf here] ]] |
| {{TOClimit|2}} | | {{TOClimit|2}} |
| ==Overview== | | ==Overview== |
| + | {{float right|{{#widget:YouTube|id=DLXsb1FwKD4}}}} |
| 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: |
| *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}} |
− | <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]] |
| + | |
| ==Planning considerations== | | ==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== | | ==Design== |
| ===Sizing=== | | ===Sizing=== |
− | [[Infiltration: Sizing and modeling]] | + | '''[[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. |
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| ==Materials== | | ==Materials== |
| ===Aggregate=== | | ===Aggregate=== |
− | {{:Gravel}} | + | {{:Reservoir aggregate}} |
| + | |
| ===Perforated Pipe=== | | ===Perforated Pipe=== |
| {{:Pipes}} | | {{:Pipes}} |
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| ==Construction== | | ==Construction== |
− | {{:Infiltration: Construction}}
| + | *[[Construction]] |
| + | |
| ==Gallery== | | ==Gallery== |
| {{:Infiltration trenches: Gallery}} | | {{:Infiltration trenches: Gallery}} |
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− | ==Incentives and Credits==
| + | ---- |
− | ===In Ontario===
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− | ===LEED BD + C v. 4===
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− | {{:LEED: Rainwater management}}
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− | ===SITES v.2===
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− | --- | |
| [[category:infiltration]] | | [[category:infiltration]] |