Changes

{|class="wikitable"

{|class="wikitable"

|+ Types of green roofs: defined by construction depth

|+ LID Guide Detail

|-  

|-  

!style="background: darkcyan; color: white"|

!style="background: darkcyan; color: white"|

!style="background: darkcyan; color: white"|Available Space

!style=   "background: darkcyan; color: white"|Available Space

!style="background: darkcyan; color: white"|Site Topography

!style="background: darkcyan; color: white"|Site Topography

!style="background: darkcyan; color: white"|Available Head

!style="background: darkcyan; color: white"|Available Head

|-

|-

! Roof Downspout Disconnection

! Roof Downspout Disconnection

|Simple downspout disconnection requires a minimum flow path length |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 ||  ||  || For simple downspout disconnection the roof drainage area should not be greater than 100 square metres ||  ||  ||  ||  ||  ||  ||  ||  

|The flow path length across the vegetated filter strip should be at least 5 metres to provide substantial water quality benefits (Barrett et al., 2004). Vegetated filter strips incorporated as pretreatment to another water quality best management practice may be designed with shorter flow path lengths.

|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 ||  ||  || 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