Changes

Due to concerns about clogging, many types of facility may be constructed with limited or no filter fabric within:

Due to concerns about clogging, many types of facility may be constructed with limited or no filter fabric within:

*The use of filter fabric is referred to as a practice in 'older bioretention designs' In the upstate forever LID guide<ref>Upstate Forever. 2005. “Bioretention - LID Fact Sheet.” Greenville, South Carolina. https://www.upstateforever.org/files/files/CAW_LIDFact_Bioretention.pdf.</ref>. They go on to suggest that a [[choker course]] by used instead to seperate the [[filter media]] and [[reservoir aggrgate]].  Filter fabric may be used in side walls and should be placed directly over and within 2 feet of the [[perforated pipe]] drains when used in an [[underdrain]].  

*The use of filter fabric is referred to as a practice in 'older bioretention designs' In the upstate forever LID guide<ref>Upstate Forever. 2005. “Bioretention - LID Fact Sheet.” Greenville, South Carolina. https://www.upstateforever.org/files/files/CAW_LIDFact_Bioretention.pdf.</ref>. They go on to suggest that a [[choker course]] by used instead to separate the [[filter media]] and [[reservoir aggregate]].  Filter fabric may be used in side walls and should be placed directly over and within 2 feet of the [[perforated pipe]] drains when used in an [[underdrain]].  

*In Finland the use of a choker course has been advocated for in place of filter fabric as replacing a clogged fabric layer would disturb established [[planting]]<ref>Tahvonen, O. 2018. Adapting Bioretention Construction Details to Local Practices in Finland. Sustainability 10(276). doi: doi:10.3390/su10020276.</ref>.  

*In Finland the use of a choker course has been advocated for in place of filter fabric as replacing a clogged fabric layer would disturb established [[planting]]<ref>Tahvonen, O. 2018. Adapting Bioretention Construction Details to Local Practices in Finland. Sustainability 10(276). doi: doi:10.3390/su10020276.</ref>.  

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