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* Trench width of 2.0 metres.
 
* Trench width of 2.0 metres.
 
* Maximum impervious drainage area to permeable surface area (I:P area) ratio of 20:1.
 
* Maximum impervious drainage area to permeable surface area (I:P area) ratio of 20:1.
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===Notes===
 
===Notes===

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