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In Ontario the vertical separation between a practice and the water table or bedrock is frequently cited as 1 meter.
In Ontario the required vertical separation between a practice and the water table or bedrock is frequently cited as 1 meter.
This comes from the
This comes from the [https://www.ontario.ca/document/stormwater-management-planning-and-design-manual-0 2003 Stormwater Management Planning and Design Manual].
''"The depth to bedrock should be greater than or equal to 1 metre below the bottom of the [[exfiltration trenches|perforated pipe]] storage media to ensure adequate drainage/hydraulic potential"<ref name=MOE2003>https://www.ontario.ca/document/stormwater-management-planning-and-design-manual/stormwater-management-plan-and-swmp-design</ref>''
''"The depth to bedrock should be greater than or equal to 1 metre below the bottom of the [[exfiltration trenches|perforated pipe]] storage media to ensure adequate drainage/hydraulic potential"<ref name=MOE2003>https://www.ontario.ca/document/stormwater-management-planning-and-design-manual/stormwater-management-plan-and-swmp-design</ref>''
Both of these considerations are equally relevant to the [[underdrain]] of any structural BMP.
Both of these considerations are equally relevant to the [[underdrain]] of any structural BMP.
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Other relevant
Other relevant