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*[[Assessing the performance of bioretention]]
 
*[[Assessing the performance of bioretention]]
 
*[[Cost-benefit considerations for bioretention]]
 
*[[Cost-benefit considerations for bioretention]]
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*[[Calculating credits for bioretention]]
 
*[[Soil amendments to enhance phosphorus sorption]]
 
*[[Soil amendments to enhance phosphorus sorption]]
 
*[[Summary of permit requirements for bioretention]]
 
*[[Summary of permit requirements for bioretention]]

Revision as of 20:00, 24 February 2016

Biofiltration (bioretention with underdrains) is designed to retain solids and associated pollutants by filtering. A typical method for assessing the performance of of BMPs with underdrains is therefore measuring and comparing pollutant concentrations at the influent and effluent. BMPs without underdrains are more difficult to assess, although considering only potential impacts to surface waters, a properly functioning infiltration system is considered to be highly performing.

An online manual for assessing BMP treatment performance was developed in 2010 by Andrew Erickson, Peter Weiss, and John Gulliver from the University of Minnesota and St. Anthony Falls Hydraulic Laboratory. The manual advises on a four-level process to assess the performance of a Best Management Practice.

  • Level 1: Visual Inspection. This includes assessments for infiltration practices and for filtration practices. The website includes links to a downloadable checklist.
  • Level 2: Capacity Testing. Level 2 testing can be applied to both infiltration and filtration practices.
  • Level 3: Synthetic Runoff Testing for infiltration and filtration practices. Synthetic runoff test results can be used to develop an accurate characterization of pollutant retention or removal, but can be limited by the need for an available water volume and discharge.
  • Level 4: Monitoring for infiltration or filtration practices

Level 1 activities do not produce numerical performance data that could be used to obtain a stormwater management credit. BMP owners and operators who are interested in using data obtained from Levels 2 and 3 should consult with the MPCA or other regulatory agency to determine if the results are appropriate for credit calculations. Level 4, Monitoring, is the method most frequently used for assessment of the performance of a BMP.

Use these links to obtain detailed information on the following topics related to BMP performance monitoring:

Additional information on designing a monitoring network and performing field monitoring are found at this link.

Related pages

Links to pages discussing assessment of other BMPs can be found at this page.