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→Design
===Design===
===Design===
<h4blue>Sizing & modeling</h4blue>
<h4>Sizing & modeling</h4>
{{:Rainwater Harvesting: Sizing and Modelling}}
{{:Rainwater Harvesting: Sizing and Modelling}}
<h4>Catchments</h4>
<h4>Catchments</h4>
<p>Decisions need to be made about the selection and grading of catchments. If one catchment is very large, can it be regraded to drain to two or more outlets? Is it desirable to capture both rooftop water and other stormwater? This will may determine the quality improvements required to use the water. See table below, which illustrates the higher treatment required for storm water (i.e. non-rooftop). </p>
<p>Decisions need to be made about the selection and grading of catchments. If one catchment is very large, can it be regraded to drain to two or more outlets? Is it desirable to capture both rooftop water and other stormwater? This will may determine the quality improvements required to use the water. See table below, which illustrates the higher treatment required for storm water (i.e. non-rooftop). </p>
<p>As a standing body of freshwater, RWH cisterns present ideal habitat for [[Pests#Mosquitoes|mosquitoes]]. Mosquitoes should be prevented from entering by using a mesh screen on all openings. Larvicides may be added when the water is only to be used for irrigation purposes.
<p>As a standing body of freshwater, RWH cisterns present ideal habitat for [[Pests#Mosquitoes|mosquitoes]]. Mosquitoes should be prevented from entering by using a mesh screen on all openings. Larvicides may be added when the water is only to be used for irrigation purposes.
To prevent algal growth, the cistern must be opaque or otherwise protect the water from light.</p>
To prevent algal growth, the cistern must be opaque or otherwise protect the water from light.</p>
<h4>Plumbing and Regulation </h4>
<h4>Plumbing and Regulation </h4>
<p>The current Ontario Building Code requires that rainwater harvesting systems are designed, constructed and installed to conform to good engineering practice. References are made to ASHRAE, ASPE[https://www.aspe.org/content/arcsaaspeansi-63-2013-rainwater-catchment-systems-electronic-download] and CSA [http://shop.csa.ca/en/canada/plumbing-products-and-materials/cancsa-b1281-06b1282-06-r2016/invt/27024892006] guides for plumbing detailing. </p>
<p>The current Ontario Building Code requires that rainwater harvesting systems are designed, constructed and installed to conform to good engineering practice. References are made to ASHRAE, ASPE[https://www.aspe.org/content/arcsaaspeansi-63-2013-rainwater-catchment-systems-electronic-download] and CSA [http://shop.csa.ca/en/canada/plumbing-products-and-materials/cancsa-b1281-06b1282-06-r2016/invt/27024892006] guides for plumbing detailing. </p>