Changes

{{:Choker layer}} Geotextiles may be used to separate the underdrain from native soils on the vertical faces.

{{:Choker layer}} Geotextiles may be used to separate the underdrain from native soils on the vertical faces.

==Alternative technology==

==Alternative technologies==

Smart Drain is a polymer ribbon-like material with capillary drains on the underside; it's use has recently been demonstrated in bioretention<ref>Redahegn Sileshi; Robert Pitt, P.E., M.ASCE; and Shirley Clark, P.E., M.ASCE Performance Evaluation of an Alternative Underdrain Material for Stormwater Biofiltration Systems, Journal of Sustainable Water in the Built Environment, 4(2), May 2018 https://doi.org/10.1061/JSWBAY.0000845 </ref>. It's low profile may make it particularly well suited to non-infiltrating practices, such as [[Stormwater planters]].  

* Smart Drain is a polymer ribbon-like material with capillary drains on the underside; it's use has recently been demonstrated in bioretention<ref>Redahegn Sileshi; Robert Pitt, P.E., M.ASCE; and Shirley Clark, P.E., M.ASCE Performance Evaluation of an Alternative Underdrain Material for Stormwater Biofiltration Systems, Journal of Sustainable Water in the Built Environment, 4(2), May 2018 https://doi.org/10.1061/JSWBAY.0000845 </ref>. It's low profile may make it particularly well suited to non-infiltrating practices, such as [[Stormwater planters]].  

[[File:Smart drain.jpg|thumb|Ribbon-like drainage material]]

[[File:Smart drain.jpg|thumb|Ribbon-like drainage material]]

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