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|Bioretention should be separated from the seasonally high water table by a minimum of one (1) metre to ensure groundwater does not intersect the filter bed.
|Bioretention should be separated from the seasonally high water table by a minimum of one (1) metre to ensure groundwater does not intersect the filter bed.
|Designers should also check whether maximum future tree canopy height in the bioretention area will not interfere with existing overhead phone and power lines.
|Designers should also check whether maximum future tree canopy height in the bioretention area will not interfere with existing overhead phone and power lines.
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!Vegetated Filter Strips
!Vegetated Filter Strips
|A limiting design factor is that the maximum flow path length across the impermeable surface should be less than 25 m.
|A limiting design factor is that the maximum flow path length across the impermeable surface should be less than 25 m.
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!Permeable Pavement
!Permeable Pavement
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|Sand or other granular materials should not be applied as anti-skid agents during winter operation because they can quickly clog the system. Winter maintenance practices should be limited to plowing, with de-icing salts applied sparingly
|Sand or other granular materials should not be applied as anti-skid agents during winter operation because they can quickly clog the system. Winter maintenance practices should be limited to plowing, with de-icing salts applied sparingly
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!Enhanced Swales
!Enhanced Swales
|Facilities receiving road or parking lot runoff should not be located within 2 year time-of-travel wellhead protection areas.
|Facilities receiving road or parking lot runoff should not be located within 2 year time-of-travel wellhead protection areas.
|Designers should ensure that the bottom of the swale is separated from the seasonally high water table or top of bedrock elevation by at least 1 m to prevent groundwater contamination
|Designers should ensure that the bottom of the swale is separated from the seasonally high water table or top of bedrock elevation by at least 1 m to prevent groundwater contamination
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