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[[File:Bioretention storage.png|thumb|box plot of nine documented bioretention media]]
 
[[File:Bioretention storage.png|thumb|box plot of nine documented bioretention media]]
 
Bioretention filter media may be assumed to have a storage capacity of 0.4.
 
Bioretention filter media may be assumed to have a storage capacity of 0.4.
 
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This has been calculated as the difference between the media porosity and field capacity from a number of studies.  
 
This has been calculated as the difference between the media porosity and field capacity from a number of studies.  
 
# Marine sand: 0.51 - 0.06 = 0.45 <ref name=Liu>Liu, Ruifen, and Elizabeth Fassman-Beck. “Pore Structure and Unsaturated Hydraulic Conductivity of Engineered Media for Living Roofs and Bioretention Based on Water Retention Data.” Journal of Hydrologic Engineering 23, no. 3 (March 2018): 04017065. doi:10.1061/(ASCE)HE.1943-5584.0001621</ref>
 
# Marine sand: 0.51 - 0.06 = 0.45 <ref name=Liu>Liu, Ruifen, and Elizabeth Fassman-Beck. “Pore Structure and Unsaturated Hydraulic Conductivity of Engineered Media for Living Roofs and Bioretention Based on Water Retention Data.” Journal of Hydrologic Engineering 23, no. 3 (March 2018): 04017065. doi:10.1061/(ASCE)HE.1943-5584.0001621</ref>
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