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<div class="col-md-8">
−<h4>Water Quantity</h4>
<p> The [https://www.ontario.ca/laws/regulation/120332 Ontario building code (OBC)] requires only that water collected from rooftops be "free of solids" for irrigation use in an external system such as a rain barrel. </p> +<p> 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. +
Many people choose to reuse or recycle a container as a rain barrel or cistern. Re-purposed containers should be screened to prevent [[Wildlife#Mosquitoes|mosquitoes]] from breeding, and should be opaque to prevent algae from growing.
Many people choose to reuse or recycle a container as a rain barrel or cistern. Re-purposed containers should be screened to prevent [[Wildlife#Mosquitoes|mosquitoes]] from breeding, and should be opaque to prevent algae from growing.
===Performance===
===Performance===
−</div>
+<h3>Water Quantity</h3>
−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 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%.
−<h4>Water Quality</h4>
+<h3>Water Quality</h3>
−The [https://www.ontario.ca/laws/regulation/120332 Ontario building code (OBC)] requires only that water collected from rooftops be "free of solids" for irrigation use in an external system such as a rain barrel.
−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).</p>
+(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.
+==Costs==
==Costs==
Many municipalities run schemes to provide homeowners with subsidized barrels. In some places barrels can be purchased from around $50. See list below.
Many municipalities run schemes to provide homeowners with subsidized barrels. In some places barrels can be purchased from around $50. See list below.