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==Design==
<h4>Sizing & modeling</h4>
<h3>Sizing & modeling</h3>
{{:Rainwater Harvesting: Sizing and Modelling}}
{{:Rainwater Harvesting: Sizing and Modelling}}
<h4>Catchments</h4>
<h3>Catchments</h3>
<div class="col-md-8">
<div class="col-md-8">
<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>
<h4>Cisterns</h4>
<h3>Cisterns</h3>
<p>Preformed above-ground tanks are usually constructed from polyethylene or galvanized steel. They are available with storage capacity up to around 50,000 L. Preformed below-ground tanks may be constructed from reinforced fiberglass or concrete. Fiberglass tanks are available up to around 150,000 L. Concrete vaults can be constructed in almost any size. Wooden tanks are less common but are also available and permitted in the regulations.</p>
<p>Preformed above-ground tanks are usually constructed from polyethylene or galvanized steel. They are available with storage capacity up to around 50,000 L. Preformed below-ground tanks may be constructed from reinforced fiberglass or concrete. Fiberglass tanks are available up to around 150,000 L. Concrete vaults can be constructed in almost any size. Wooden tanks are less common but are also available and permitted in the regulations.</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.