From LID SWM Planning and Design Guide
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  • Mulch should be applied on the surface of the BMP in a layer of 75 -100 mm.
  • As in other landscaping applications, the mulch helps to preserve soil moisture for plant survival, and suppresses weed growth.
  • Mulch is considered to be an normal finishing touch to many types of formal landscaping. Maintaining mulch application can help increase aesthetic value of LID BMPs.
  • Shredded hardwood mulch is generally recommended for LID facilities. Its fibrous texture knits together somewhat; providing limited erosion control. In areas with particularly high flow (e.g. around inlets) inorganic mulch or coarse decorative aggregate is recommended instead, as these will not float. All organic mulches have the potential to float and migrate in surface flow, after a previously dry period. [1]
  • Regular fresh applications of wood mulch also promotes denitrification, reducing nitrates in impacted surface waters.

  1. 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