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|+   <h3>'''LID Design Guide Detail'''</h3>

|+LID Design Guide Detail

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!Vehicle Loading

!Vehicle Loading

!Structural Requirements

!Structural Requirements

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!Roof Downspout Disconnection

!Roof Downspout Disconnection

|Simple downspout disconnection requires a minimum flow path length across the pervious area (at least 5 metres) and suitable soil conditions. If the flow path length is less than 5 metres and soils are hydrologic soil group (HSG) C or D, roof downspouts should be directed to another LID practice such as a rainwater harvesting system, soakaway, swale, bioretention area or perforated pipe system.

|Simple [[downspout disconnection]] requires a minimum flow path length across the pervious area (at least 5 metres) and suitable soil conditions. If the flow path length is less than 5 metres and soils are hydrologic soil group (HSG) C or D, roof downspouts should be directed to another LID practice such as a rainwater harvesting system, soakaway, swale, bioretention area or perforated pipe system.

|Disconnected downspouts should discharge to a gradual slope that conveys runoff away from the building. The slope should be between 1% and 5%. Grading should discourage flow from reconnecting with adjacent impervious surfaces

|Disconnected downspouts should discharge to a gradual slope that conveys runoff away from the building. The slope should be between 1% and 5%. Grading should discourage flow from reconnecting with adjacent impervious surfaces

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|For simple downspout disconnection the roof drainage area should not be greater than 100 square metres

|For simple downspout disconnection the roof drainage area should not be greater than 100 square metres

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|Facilities receiving road or parking lot runoff should not be located within two (2) year time-of-travel wellhead protection areas

|Facilities receiving road or parking lot runoff should not be located within two (2) year time-of-travel wellhead protection areas

|The bottom of the facility should be vertically separated by one (1) metre from the seasonally high water table or top of bedrock elevation

|The bottom of the facility should be vertically separated by one (1) metre from the seasonally high water table or top of bedrock elevation

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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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|Filter strips should only be used where depth to the seasonally high water table is at least 1 m below the surface.

|Filter strips should only be used where depth to the seasonally high water table is at least 1 m below the surface.

|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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|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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|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

|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

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|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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|Facilities receiving road or parking lot runoff should not be located within two (2) year time-of-travel wellhead protection areas.

|Facilities receiving road or parking lot runoff should not be located within two (2) year time-of-travel wellhead protection areas.

|Designers should ensure that the bottom of the gravel bed 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 gravel bed 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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|Load bearing capacity of the building structure and selected roof deck need to be sufficient to support the weight of the soil, vegetation and accumulated water or snow, and may also need to support pedestrians, concrete pavers, etc.

|Load bearing capacity of the building structure and selected roof deck need to be sufficient to support the weight of the soil, vegetation and accumulated water or snow, and may also need to support pedestrians, concrete pavers, etc.

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|Underground cisterns should be placed in areas without vehicular traffic. Tanks under roadways, parking lots, or driveways must be designed for the live loads from heavy trucks, a requirement that could significantly increase construction costs.

|Underground cisterns should be placed in areas without vehicular traffic. Tanks under roadways, parking lots, or driveways must be designed for the live loads from heavy trucks, a requirement that could significantly increase construction costs.

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