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Line 55: Pre-treatment structures are most cost effective when they slow down incoming flows, collect sediment for easy clean out, and slowly release water to the bioretention facility mitigating erosion. [[Pretreatment]] structures/strategies can include [[curb cuts]], [[Aggregates]], proprietary devices like filters or hydrodynamic separators, vegetation, concrete sumps, membrane filters, overland flow sumps, etc. '''Construction Steps:'''*Installation of pre-treatment features will vary based upon type. Similarly, installation timeline will range with type and could occur at excavation and mass grading, curb work or at finishing grade. Given pre-treatment features are typically integrated with the LID inlet coordination amongst multiple sub-contractors is sometime needed. The following details steps for various pre-treatment types:*Vegetation: Follow the guidance shown below in the section “Plant Material Verification and Installation”*Curbing: Follow the guidance shown above in the section “Curbing”.*Aggregate: Follow the guidance shown above in the section “Stone reservoir”.<gallery mode="packed" widths=300px heights=300px>IMG_0891.JPG|Aggregate material (rock) installed as the inlet and pre-treatment device in the rain garden at Glendale P.S. in Brampton, ON. The runoff comes from a vegetated swale into the inlet, conveying it into the rain garden.IMG_0744.JPG|Aggregate material (rock) installed as the inlet and pre-treatment device in the rain garden at Glendale P.S. in Brampton, ON. The runoff comes from a vegetated swale into the inlet, conveying it into the rain garden.IMG_0788-1.JPG|Aggregate material (rock) installed as the inlet and pre-treatment device in the rain garden at Glendale P.S. in Brampton, ON. The runoff comes from a vegetated swale into the inlet, conveying it into the rain garden.</gallery>[[Category:Gallery]]*Proprietary pre-treatment device: #Excavate and prepare base for proprietary pre-treatment device according to design. #Install proprietary pre-treatment device according manufacturer directions.#Manufacturer representative may need to confirm proper installation and functioning through approved testing and inspection. <br><gallery mode="packed" widths=275px heights=275px>P1160102.JPG|Installation of Jellyfish filter and sorbtive media vault at the IMAX bioswale project in Mississauga, ON.P1160117.JPG|Installation of Jellyfish filter and sorbtive media vault at the IMAX bioswale project in Mississauga, ON.P1160121.JPG|Installation of Jellyfish filter and sorbtive media vault at the IMAX bioswale project in Mississauga, ON.</gallery>[[Category:Gallery]]'''Key Inspection Points:'''*Verify that the correct pre-treatment device (jellyfish filter, vegetation, curbing, etc.) is being installed.*Verify that all components of the pre-treatment device are installed*Verify correct size and location of pre-treatment device.*Verify correct elevation, slope, and footing according to design*Is it tied into the curb, downspout, or other inlet? Or could happen before the curbing?*Wet weather performance check: **Does it work? **Is water entering the LID facility properly?**Is sediment and debris accumulating?**Is it dissipating erosive forces?'''Mistakes to Avoid:'''*Pre-treatment component parts are missing*Grading/elevation errors that deviates from design**Incorrect pipe inverts causing short circuiting**Insufficient grade drop or slope into pre-treatment to ensure positive flow of water **Improper grading from pre-treatment to LID feature inhibiting positive flow**Insufficient sump depth to account for sediment and debris accumulation*Using wrong concrete forms if concrete curbs are part of pre-treatment.For more information about pre-treatment strategies and their design, visit these page: [[Pretreatment]] and [[Pretreatment features]].
→Pretreatment and inlet
==Pretreatment and inlet==
==Pretreatment and inlet==
{{:Construction: pretreatment and inlet}}
{{:Construction: pretreatment and inlet}}
==References==
==References==
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