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→Planning Considerations
===Water Table===
===Water Table===
Maintaining a separation of one (1) metre between the elevations of the base of the practice and the seasonally high water table, or top of bedrock is recommended. Lesser or greater values may be considered based on groundwater mounding analysis. See STEP LID Planning and Design Guide wiki page, [[Groundwater]] for further guidance and spreadsheet tool.
Maintaining a separation of one (1) metre between the elevations of the base of the practice and the seasonally high water table, or top of bedrock is recommended. Lesser or greater values may be considered based on groundwater mounding analysis. See STEP LID Planning and Design Guide wiki page, [[Groundwater]] for further guidance and spreadsheet tool.
===Pollution Hot Spot Runoff===
To protect groundwater from possible contamination, runoff from pollution hot spots should not be treated by infiltration trenches, chambers or soakaways.
===Proximity to Underground Utilities===
Designers should consult local utility design guidance for the horizontal and vertical clearances required between storm drains.
===Karst===
Infiltration trenches, chambers and soakaways are not suitable in areas of known or implied karst topography.
===Setback from Buildings===
Facilities should be setback a minimum of four (4) metres from building foundations.
==Design==
==Design==