Changes

==Overview==

==Overview==

[[Rainwater harvesting]] is the process of intercepting, conveying and storing rainfall for future use. The term “rainwater harvesting” (RWH) is used herein to refer to capturing rainfall onto rooftops (i.e. “roofwater”) and stormwater runoff from the ground surface (i.e. “stormwater”), and then reusing for irrigation or other greywater-approved uses. The rain that falls upon a catchment surface, such as a roof, is collected and conveyed into a storage facility. Storage tanks, a common method for storage, range in size from rain barrels for residential land uses (typically 190 to 400 litres in size), to large cisterns for industrial, commercial and institutional land uses. A typical pre-fabricated cistern can range from 750 to 40,000 litres in size. STEP has prepared life cycle costs estimates for each design configuration, based on a 2,000 m² road drainage area, runoff control target of 25 mm depth and 72 hour drainage period, for comparison which can be viewed below. To generate your own life cycle cost estimates customized to the development context, design criteria, and constraints applicable to your site, access the updated [https://sustainabletechnologies.ca/lid-lcct/ LID Life Cycle Costing Tool (LCCT) here].

[[Rainwater harvesting]] is the process of intercepting, conveying and storing rainfall for future use. The term “rainwater harvesting” (RWH) is used herein to refer to capturing rainfall onto rooftops (i.e. “roofwater”) and stormwater runoff from the ground surface (i.e. “stormwater”), and then reusing for irrigation or other greywater-approved uses. The rain that falls upon a catchment surface, such as a roof, is collected and conveyed into a storage facility. Storage tanks, a common method for storage, range in size from rain barrels for residential land uses (typically 190 to 400 litres in size), to large cisterns for industrial, commercial and institutional land uses. A typical pre-fabricated cistern can range from 750 to 50,000 litres in size. STEP has prepared life cycle costs estimates for each design configuration, based on a 2,000 m² roof drainage area, runoff control target of 25 mm depth and 72 hour drainage period, for comparison which can be viewed below. To generate your own life cycle cost estimates customized to the development context, design criteria, and constraints applicable to your site, access the updated [https://sustainabletechnologies.ca/lid-lcct/ LID Life Cycle Costing Tool (LCCT) here].

==Design Assumptions==

==Design Assumptions==

==Cost Summary Tables==

==Cost Summary Tables==

Total life cycle cost estimates for the [[Enhanced swale]] Full Infiltration design configuration is ($23,451.36), makign it one of the cheapest LID BMP options.<br>

Total life cycle cost estimates for an [[Rainwater harvesting|Underground Rainwater Cistern]], Non-Infiltrating configuration is ($92,343.04), making it one of the cheapest LID BMP options.<br>

It is notable that a sensitivity analysis was conducted in 2019 to compare construction cost estimates generated by the tool to actual costs of implemented projects. '''The analysis found that tool estimates were typically within ±14% of actual construction costs'''<ref>Credit Vally Conservation (CVC). 2019. Life-cycle costing tool 2019 update: sensitivity analysis. Credit Valley Conservation, Mississauga, Ontario. https://sustainabletechnologies.ca/app/uploads/2020/04/LCCT-Sensitivity-Analysis_March2020.pdf</ref>

It is notable that a sensitivity analysis was conducted in 2019 to compare construction cost estimates generated by the tool to actual costs of implemented projects. '''The analysis found that tool estimates were typically within ±14% of actual construction costs'''<ref>Credit Vally Conservation (CVC). 2019. Life-cycle costing tool 2019 update: sensitivity analysis. Credit Valley Conservation, Mississauga, Ontario. https://sustainabletechnologies.ca/app/uploads/2020/04/LCCT-Sensitivity-Analysis_March2020.pdf</ref>

===Full Infiltration===

===Full Infiltration===

[[File:CVC Office, Grass Swale.JPG|500px|thumb|Enhanced Grass [[swale]] in CVC headquarters parking lot, Mississauga ON.]]

[[File:RWH rain barrel.PNG|500px|thumb|A residential [[rain barrels|rain barrel]] collecting roofwater from the house installed with a diverter to ensure water does not overflow the system when full and allows water to instead bypass the barrel and enter directly into the storm sewer through a storm lateral or enter an on site [[dry swale]] or [[infiltration trench]], if installed.]]

[[File:Design Table EnhancedSwales Full Infil.PNG|700px]]<br>

[[File:Design Table RWH No Infil.PNG|700px]]<br>

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==References==

==References==