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Line 28: <p>Total cistern volume can be estimated by multiplying the depth of design storm the catchment area. <br>One millimeter of rain landing on 1 m<sup>2</sup> results in 1 L of runoff. <br>For example, the 90th percentile event in Barrie is 26 mm, so every 1 m<sup>2</sup> of rooftop will generate 26 L during this storm event.<br> A 2000 m<sup>2</sup> building would generate approximately 54,000 L. <br>The designers have three choices:-<ol><li>Construct a suitably sized concrete vault underground to capture all 54,000 L of the water</li><li>Alter the slope of the roof to create two or more catchments, the smaller catchments may be diverted to plastic or fiberglass cisterns</li><li>Design 1. or 2. slightly undersized for this storm, with additional capacity in an infiltration system to capture overflow. Examples include [[Bioretention Cells|bioretention cells]] or [[Infiltration Chambers|infiltration chambers]]. </li> </ol></p>
Rainwater harvesting: Sizing and modeling (view source)
Revision as of 20:36, 26 June 2017
, 7 years ago→Rapid
<p><strong>When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.7</strong> <br>
<p><strong>When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub> <0.7</strong> <br>
The total storage required is the sum of V<sub>S</sub> and Y<sub>0.05</sub>. </p>
The total storage required is the sum of V<sub>S</sub> and Y<sub>0.05</sub>. </p>
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