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*Regular fresh applications of wood mulch can also promote denitrification, reducing nitrates in impacted surface waters.
*Regular fresh applications of wood mulch can also promote denitrification, reducing nitrates in impacted surface waters.
*Double-shredded hardwood or softwood mulch is recommended for LID facilities. Its fibrous texture knits together somewhat; providing limited erosion control.
*Double-shredded hardwood or softwood mulch is recommended for LID facilities. Its fibrous texture knits together somewhat; providing limited erosion control.
−*Mulch can also help to maintain the organic matter content of filter media, which provides cation exchange capacity for pollutant removal.
+*Mulch can also help to maintain the organic matter content of underlying filter media, which provides cation exchange capacity for pollutant removal.
===Contraindication===
===Contraindication===
−*In areas with particularly high flow (e.g. around [[inlets]] and [[forebays]]) coarse decorative aggregate or [[stone]] is recommended instead, as these will not float. All organic mulches have the potential to float and migrate in surface flow, particularly after a previously dry period. <ref> Simcock, R and Dando, J. 2013. Mulch specification for stormwater bioretention devices. Prepared by Landcare Research New Zealand Ltd for Auckland Council. Auckland Council technical report, TR2013/056 </ref>
+*In areas with particularly high flow (e.g. around [[inlets]] and [[forebays]]) coarse decorative aggregate or [[stone]] is recommended to cover the filter bed, to better dissipate energy. All organic mulches have the potential to float and migrate in surface flow, particularly after a previously dry period. <ref> Simcock, R and Dando, J. 2013. Mulch specification for stormwater bioretention devices. Prepared by Landcare Research New Zealand Ltd for Auckland Council. Auckland Council technical report, TR2013/056 </ref>
−*This advice also holds for [[stormwater planters]], which often experience concentrated flow from a [[downspout disconnection]] or similar.
+*This advice also holds for [[stormwater planters]], which often experience concentrated flow from a [[downspout disconnection| roof downspout or drain]].
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[[Category:Materials]]
[[Category:Materials]]
[[Category:Green infrastructure]]
[[Category:Green infrastructure]]