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Line 1: − {| class="wikitable" style="width: 150%; height: 200px;"+ − |+ LID Design Guide Detail − − |- − !style="background: cyan; color: black"| − !style="background: cyan; color: black"|Available Space − !style="background: cyan; color: black"|Site Topography − !style="background: cyan; color: black"|Available Head − !style="background: cyan; color: black"|Soils − !style="background: cyan; color: black"|Pollution Hot Spot Runoff − !style="background: cyan; color: black"|Setbacks from Buildings − !style="background: cyan; color: black "|Proximity to Underground Utilities − !style="background: cyan; color: black"|Set Backs − !style="background: cyan; color: black"|Drainage Area and Runoff Volume − !style="background: cyan; color: black"|Wellhead Protection − !style="background: cyan; color: black"|Water Table − !style="background: cyan; color: black"|Overhead Wires − !style="background: cyan; color: black"|Flow Path Length Across Impermeable Surface − !style="background: cyan; color: black"|Winter Operations − !style="background: cyan; color: black"|Vehicle Loading − !style="background: cyan; color: black"|Structural Requirements − !style="background: cyan; color: black"|Roof Slope − |- − ![[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. − |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 − | − |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. − |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 − | − | − − |- − !Cistern − !Not applicable − !|1:1||Not applicable||0||0||0||Yes||None||None||None − − |- − !Roof Downspout Disconnection − !Not applicable − !|[5 to 100 m<sup>2</sup>]||Amend if < 15 mm/hr||0.5||5 to 20||1 to 5||Yes||Building Foundation||None||None − |- − !Soakaway, Infiltration Trench or Chamber − !1 − !|5:1 to 20:1||Not a constraint||1 to 2||0 to 1||<15 %||No||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||1 m||2 yr − |- − !Bioretention − !1 − !|5:1 to 15:1||Underdrain required<br>if < 15 mm/hr||1 to 2||5 to 10||0 to 2||No||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||1 m||2 yr − |- − !Biofilter (Filtration only Bioretention Design) − !Not applicable − !|5:1||Not applicable||1 to 2||2 to 5||0 to 2||Yes||Building Foundation, Trees||None||None − |- − !Vegetated Filter Strip − !1 − !|5:1||Amend if < 15 mm/hr||0 to 1||15 to 20||1 to 5||No||None||None||None − |- − !Permeable Pavement − !1 − !|1:1 to 1.2:1||Underdrain Required <br> if < 15 mm/hr||0.5 to 1||0||1 to 5||No||4m-Underground Utilities<br>Drinking Water Wellhead<br>Protection Areas||1 m||2 Yr − |- − !Enhanced Grass Swale − !1 − !|5:1 to 10:1||Not applicable||1 to 3||5 to 15||0.5 to 6||No||4m- Building Foundation<br>Underground Utilities||1 m||None − |- − !Dry Swale (Bioswale) − !1 − !|5:1 to 15:1||Underdrain Required <br> if < 15 mm/hr||1 to 3||5 to 10||0.5 to 6||No||4m (3m if impermeable liner<br>is used)Building foundation,<br> Underground utilities, drinking<br>water wellhead protection areas||1 m||2 Yr − |- − !Perforated Pipe System − !1 − !|5:1 to 10:1||Not a constraint||1 to 3||0||< 15%||No||4m- Building Foundation<br>Underground Utilities, Trees,<br>Drinking Water Wellhead<br>Protection Areas||1 m||2 Yr − |}
Redirected page to Site considerations
#REDIRECT [[Site considerations]]