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===Rapid===
 
===Rapid===
<p>Total cistern volume can be estimated by multiplying the depth of design storm the catchment area. <br>1 mm of rain over 1 m<sup>2</sup> results in 1 L of runoff. <br>
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<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. A 2000 m<sup>2</sup> building would generate 54,000 L of runoff.
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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 and a 2000 m<sup>2</sup> building generates 54,000 L of runoff. <br>
 
The designers have three choices:-
 
The designers have three choices:-
 
<ol>
 
<ol>
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