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→Other references of interest
The CSA standard W200, Design of bioretention systems, requires a minimum vertical separation of 0.6 m between the base of bioretention and the water table<ref>CSA Group. (n.d.). W200-18 Design of bioretention systems. Retrieved from https://store.csagroup.org/ccrz__ProductDetails?sku=2704497</ref>
The CSA standard W200, Design of bioretention systems, requires a minimum vertical separation of 0.6 m between the base of bioretention and the water table<ref>CSA Group. (n.d.). W200-18 Design of bioretention systems. Retrieved from https://store.csagroup.org/ccrz__ProductDetails?sku=2704497</ref>
The Ontario building Code requires
The Ontario Building Code requires
<ref>Province of Ontario. “O. Reg. 332/12: BUILDING CODE,” 2018. https://www.ontario.ca/laws/regulation/120332.</ref>
<ref>Province of Ontario. “O. Reg. 332/12: BUILDING CODE,” 2018. https://www.ontario.ca/laws/regulation/120332.</ref>
<ref>Stall, Christopher, Aziz Amoozegar, David Lindbo, Alexandria Graves, and Diana Rashash. “Transport of E. Coli in a Sandy Soil as Impacted by Depth to Water Table.” Journal of Environmental Health 76, no. 6: 92–100. Accessed October 23, 2018. http://www.ncbi.nlm.nih.gov/pubmed/24645419.</ref>
<ref>Stall, Christopher, Aziz Amoozegar, David Lindbo, Alexandria Graves, and Diana Rashash. “Transport of E. Coli in a Sandy Soil as Impacted by Depth to Water Table.” Journal of Environmental Health 76, no. 6: 92–100. Accessed October 23, 2018. http://www.ncbi.nlm.nih.gov/pubmed/24645419.</ref>
Rhode Island (largely located on glacial till with loamy sands) clarified their position on vertical separation in 2016 in relation to LID including:
*reduction to 0.6 m when infiltrating water from residential roofs and driveways,
*flexibility when siting projects on brownfield (contaminated) land,
*limited flexbility in retrofit scenarios, and
*accounting for [[bioretention media]] as part of the overall separation depth from surface water to groundwater.
<ref>RI Department of Environmental Management. “Section 5.5.1 and 5.5.4 RISDISM Guidance -- Filtering Systems: Separation to Seasonal High Groundwater Table,” 2016.</ref>
<ref>RI Department of Environmental Management. “Section 5.5.1 and 5.5.4 RISDISM Guidance -- Filtering Systems: Separation to Seasonal High Groundwater Table,” 2016.</ref>