Changes

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

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

|-

|-

!style="background: cyan; color: black"|

|

!style="background: cyan; color: black"|Available Space

!Available Space

!style="background: cyan; color: black"|Site Topography

!Site Topography

!style="background: cyan; color: black"|Available Head

!Available Head

!style="background: cyan; color: black"|Soils

!Soils

!style="background: cyan; color: black"|Pollution Hot Spot Runoff

!Pollution Hot Spot Runoff

!style="background: cyan; color: black"|Setbacks from Buildings

!Setbacks from Buildings

!style="background: cyan; color: black "|Proximity to Underground Utilities

!Proximity to Underground Utilities

!style="background: cyan; color: black"|Drainage Area and Runoff Volume

!Drainage Area and Runoff Volume

!style="background: cyan; color: black"|Wellhead Protection

!Wellhead Protection

!style="background: cyan; color: black"|Water Table

!Water Table

!style="background: cyan; color: black"|Overhead Wires

!Overhead Wires

!style="background: cyan; color: black"|Flow Path Length Across Impermeable Surface

!Flow Path Length Across Impermeable Surface

!style="background: cyan; color: black"|Winter Operations

!Winter Operations

!style="background: cyan; color: black"|Vehicle Loading

!Vehicle Loading

!style="background: cyan; color: black"|Structural Requirements

!Structural Requirements

!style="background: cyan; color: black"|Roof Slope

!Roof Slope

|-

|-

!'''Roof Downspout Disconnection'''

!Roof Downspout Disconnection

!<span style="font-size:80%;background:white; color: black;text-align: left"|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.

!<span style="font-size:80%;background:white; color: black;text-align: left"|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

|

|

!<span style="font-size:80%;background:white; color: black;text-align: left"|If the infiltration rate of soils in the pervious area is less than 15 mm/hr, they should be tilled to a depth of 300 mm and amended with compost to achieve an organic content in the range of 8 to 15% by weight or 30 to 40% by volume.

|If the infiltration rate of soils in the pervious area is less than 15 mm/hr, they should be tilled to a depth of 300 mm and amended with compost to achieve an organic content in the range of 8 to 15% by weight or 30 to 40% by volume.

!<span style="font-size:80%;background:white; color: black;text-align: left"|Downspout disconnection can be used where land uses or activities at ground-level have the potential to generate highly contaminated runoff as long as the roof runoff is kept separate from runoff from groundlevel impervious surfaces

|Downspout disconnection can be used where land uses or activities at ground-level have the potential to generate highly contaminated runoff as long as the roof runoff is kept separate from runoff from groundlevel impervious surfaces

|

|

|

|

!<span style="font-size:80%;background:white; color: black;text-align: left"|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

|

|

|

|

|-

|-

|-

|-

!'''Soakaways, Infiltration Trenches and Chambers'''

!Soakaways, Infiltration Trenches and Chambers

|

|

!<span style="font-size:80%;background:white; color: black;text-align: left"|Facilities cannot be located on natural slopes greater than 15%

|Facilities cannot be located on natural slopes greater than 15%

|

|

!<span style="font-size:80%;background:white; color: black;text-align: left"|Soakaways, infiltration trenches and chambers can be constructed over any soil type, but hydrologic soil group A or B soils are best for achieving water balance and channel erosion control objectives. If possible, facilities should be located in portions of the site with the highest native soil infiltration rates.

|Soakaways, infiltration trenches and chambers can be constructed over any soil type, but hydrologic soil group A or B soils are best for achieving water balance and channel erosion control objectives. If possible, facilities should be located in portions of the site with the highest native soil infiltration rates.

!<span style="font-size:80%;background:white; color: black;text-align: left"|To protect groundwater from possible contamination, source areas where land uses or human activities have the potential to generate highly contaminated runoff should not be treated by soakaways, infiltration trenches or chambers.

|To protect groundwater from possible contamination, source areas where land uses or human activities have the potential to generate highly contaminated runoff should not be treated by soakaways, infiltration trenches or chambers.

!<span style="font-size:80%;background:white; color: black;text-align: left"|Facilities should be setback a minimum of four (4) metres from building foundations

!<span style="font-size:80%;background:white; color: black;text-align: left"|Facilities should be setback a minimum of four (4) metres from building foundations

!<span style="font-size:80%;background:white; color: black;text-align: left"|Local utility design guidance should be consulted to define the horizontal and vertical offsets. Generally, requirements for underground utilities passing near the practice will be no different than for utilities in other pervious areas

!<span style="font-size:80%;background:white; color: black;text-align: left"|Local utility design guidance should be consulted to define the horizontal and vertical offsets. Generally, requirements for underground utilities passing near the practice will be no different than for utilities in other pervious areas