Changes

===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 m² results in 1 L of runoff. <br>

<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 m² results in 1 L of runoff. <br>

For example, the 90th percentile event in Barrie is 26 mm, so every 1 m² of rooftop will generate 26 L during this storm event. A 2000 m² building would generate 54,000 L of runoff.

For example, the 90th percentile event in Barrie is 26 mm, so every 1 m² of rooftop will generate 26 L during this storm event and a 2000 m² building generates 54,000 L of runoff. <br>

The designers have three choices:-

The designers have three choices:-

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