Changes

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.

This has been calculated as the difference between the media porosity and field capacity.  

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>

# 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 <rev name=Liu/>

# Marine sand with 20 % compost: 0.53 - 0.12 = 0.41 <ref name=Liu/>

# Marine sand with 20 % compost & 20 % topsoil: 0.52 - 0.16 = 0.36 <ref name=Liu/>

# Marine sand with 20 % compost & 20 % topsoil: 0.52 - 0.16 = 0.36 <ref name=Liu/>

# Sand: 0.46 - 0.1 = 0.36 <ref>Saxton, K E, and W J Rawls. “Soil Water Characteristic Estimates by Texture and Organic Matter for Hydrologic Solutions.” Soil Science Society of America Journal, 2006. doi:10.2136/sssaj2005.0117. </ref>

# Sand: 0.46 - 0.1 = 0.36 <ref>Saxton, K E, and W J Rawls. “Soil Water Characteristic Estimates by Texture and Organic Matter for Hydrologic Solutions.” Soil Science Society of America Journal, 2006. doi:10.2136/sssaj2005.0117. </ref>