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In Ontario the vertical separation between a practice and the water table or bedrock is frequently cited as 1 meter.
This comes from the
"The depth to bedrock should be greater than or equal to 1 metre below the bottom of the perforated pipe storage media to ensure adequate drainage/hydraulic potential"<refname=MOE2003>https://www.ontario.ca/document/stormwater-management-planning-and-design-manual/stormwater-management-plan-and-swmp-design
"If a pervious pipe system is implemented in an area where the seasonally high water table is higher than the obvert of the pipe, the pipe will drain the groundwater table. In this scenario, depending on the native soil characteristics and whether the trench or pipe is wrapped in geotextile fabric, soil can be transported into the pipe system undermining the pipe foundation and leading to structural failure. Pervious pipe systems should not be implemented in areas where the seasonal high groundwater level is within 1 metre of the bottom of the storm sewer backfill to ensure this does not happen." <refname=MOE2003/)
<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>