Vertical separation

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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"[1] "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." [2]

[3]


[4]


[5]


[6]


[7] in turn citing [8]

  1. ↑ https://www.ontario.ca/document/stormwater-management-planning-and-design-manual/stormwater-management-plan-and-swmp-design
  2. ↑ Province of Ontario. “O. Reg. 332/12: BUILDING CODE,” 2018. https://www.ontario.ca/laws/regulation/120332.
  3. ↑ Karathanasis, A D, T G Mueller, B Boone, and Y L Thompson. “Nutrient Removal from Septic Effluents as Affected by Soil Thickness and Texture.” Journal of Water and Health 4, no. 2 (June 2006): 177–95. http://www.ncbi.nlm.nih.gov/pubmed/16813011.
  4. ↑ 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.
  5. ↑ RI Department of Environmental Management. “Section 5.5.1 and 5.5.4 RISDISM Guidance -- Filtering Systems: Separation to Seasonal High Groundwater Table,” 2016.
  6. ↑ Ontario. “F-6-1 Procedures to Govern Separation of Sewers and Watermains | Ontario.Ca,” 2016. https://www.ontario.ca/page/f-6-1-procedures-govern-separation-sewers-and-watermains.
  7. ↑ Rathfelder, K., and M. Wei. “Underground Stormwater Infiltration: Best Practice for Protection of Groundwater Resources in British Columbia,” 2014. http://www.env.gov.bc.ca/wsd/plan_protect_sustain/groundwater/library.html
  8. ↑ Washington St.ate Department of Ecology. “Guidance for UIC Wells That Manage Stormwater,” 2006.

The upper surface of the zone of saturation, except where the surface is formed by an impermeable body.

Subsurface water level which is defined by the level below which all the spaces in the soil are filled with water; The entire region below the water table is called the saturated zone.

Natural or artificial means of intercepting and removing surface or subsurface water (usually by gravity).

The upper surface of the zone of saturation, except where the surface is formed by an impermeable body.

The natural ground material characteristic of or existing by virtue of geographic origin.

Filter fabric that is installed to separate dissimilar soils and provide runoff filtration and contaminant removal benefits while maintaining a suitable rate of flow; may be used to prevent fine-textured soil from entering a coarse granular bed, or to prevent coarse granular from being compressed into underlying finer-textured soils.

A strain of bacteria found in the gut and waste products of animals. Some strains of this bacterium can be harmful to humans or animals if consumed. Food or water can become contaminated with E.Coli where unsanitary conditions exist.

The slow movement of water into or through a soil or drainage system.

Penetration of water through the ground surface.

Surface runoff from at-grade surfaces, resulting from rain or snowmelt events.

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