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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.  
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# 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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# Marine sand: 0.51 - 0.06 = 0.45  
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<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 with 10 % compost: 0.51 - 0.11 = 0.40 <ref name= Liu/>
 
# Marine sand with 10 % compost: 0.51 - 0.11 = 0.40 <ref name= Liu/>
 
# Marine sand with 20 % compost: 0.53 - 0.12 = 0.41 <ref name= Liu/>
 
# Marine sand with 20 % compost: 0.53 - 0.12 = 0.41 <ref name= Liu/>
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