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→Performance
==Performance==
==Performance==
===Water Quantity===
===Water Quantity===
The effectiveness of rain barrels depends heavily on whether the homeowner will utilize the stored water. The use of rain barrels (190L) across a watershed of 100 residential units has been modelled for a number of U.S. cities[http://onlinelibrary.wiley.com/doi/10.1111/jawr.12038/abstract]. In Philadelphia and Milwaukee (reflecting the most similar climates to Southern Ontario) the use of rain barrels for irrigation only, provided an annual stormwater reduction of less than 2%.
The effectiveness of rain barrels depends heavily on whether the homeowner will utilize the stored water. The use of rain barrels (190L) across a watershed of 100 residential units has been modelled for a number of U.S. cities[http://onlinelibrary.wiley.com/doi/10.1111/jawr.12038/abstract]. In Philadelphia and Milwaukee (reflecting the most similar climates to Southern Ontario) the use of rain barrels for irrigation only, provided an annual stormwater reduction of less than 2%.
There is a draft of [https://www.iccsafe.org/wp-content/uploads/110116-Draft-CSA_ICC-B805-Rainwater-Harvesting.pdf CSA B805 draft] currently under review. The scope of the document includes single family dwellings. But the guide is still under review and may not account for rain barrel systems when officially published.
There is a draft of [https://www.iccsafe.org/wp-content/uploads/110116-Draft-CSA_ICC-B805-Rainwater-Harvesting.pdf CSA B805 draft] currently under review. The scope of the document includes single family dwellings. But the guide is still under review and may not account for rain barrel systems when officially published.
(comments made in reference to draft v. 2, on 1st June 2017).
(comments made in reference to draft v. 2, on 1st June 2017).
Research in warm climates (Texas and Greece) has demonstrated that first flush diverters improve the chemical characteristics of the harvested rainwater[http://www.sciencedirect.com/science/article/pii/S0043135410008535][http://www.sciencedirect.com/science/article/pii/S0022169412006993]. However, the use of diverters does not prevent the development of pathogens in stored water.
Research in warm climates (Texas and Greece) has demonstrated that first flush diverters improve the chemical characteristics of the harvested rainwater[http://www.sciencedirect.com/science/article/pii/S0043135410008535][http://www.sciencedirect.com/science/article/pii/S0022169412006993]. However, the use of diverters does not prevent the development of pathogens in stored water. Rain barrels are not typically accepted to provide any quantifiable water quality treatment beyond that achieved through runoff volume and pollutant load reduction.
==Costs==
==Costs==