Changes

==Bioretention==

==Bioretention==

Please see below a profile and plan view (along with a larger scale intersection plan view) of a bioretention facility designed in an urban [[curb extension|curb extension/"bump-out"]] designed to both calm traffic, enhance green space in an urban setting and treat overflow/runoff from the nearby street. Given that the bioretention is bound entirely with impermeable hardscape there is limited options for pretreatment. In the cross-sections shown below the pretreatments included in the installation are the inclusion of sediment traps [[Pretreatment features|sediment traps - a type of forebay]], which dissipates incoming flow into the feature and causes suspended sediment to settle out of the water. This allows for accumulated sediment to be cleaned out during general maintenance of the bioretention feature.   

Please see below a profile and plan view (along with a larger scale intersection plan view) of a bioretention facility designed in an urban [[curb extension|curb extension/"bump-out"]] designed to both calm traffic, enhance green space in an urban setting and treat overflow/runoff from the nearby street. Given that the bioretention installation is bound entirely with impermeable hardscape there is limited options for pretreatment. In the cross-sections shown below the pretreatments included in the installation are the inclusion of sediment traps [[Pretreatment features|sediment traps - a type of forebay]], which dissipate incoming flow into the feature and causes suspended sediment to settle out of the water. This allows for accumulated sediment to be cleaned out during general maintenance of the bioretention feature.   

An excellent opportunity for integrating more bioretention into the street is through careful design of curb extensions for traffic control  <ref>https://greenactioncentre.ca/healthy-travel/traffic-calming-101/#:~:text=A%20curb%20extension%2C%20or%20curb,to%20reduce%20speed%20(above)</ref>. See [[Roadside safety]] for design advice specific to this application. This drawing also depicts partial exfiltration with an installed underdrain as soils in this feature possess infiltration rates lower than 15mm/hr, and possesses several plantings. Remaining stormwater runoff is directed to the nearby storm sewer system.  

An excellent opportunity for integrating more bioretention into the street is through careful design of curb extensions for traffic control  <ref>https://greenactioncentre.ca/healthy-travel/traffic-calming-101/#:~:text=A%20curb%20extension%2C%20or%20curb,to%20reduce%20speed%20(above)</ref>. See [[Roadside safety]] for design advice specific to this application. This drawing also depicts partial exfiltration with an installed underdrain as soils in this feature possess infiltration rates lower than 15mm/hr, and possesses several plantings. Remaining stormwater runoff is directed to the nearby storm sewer system.