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*[[Pipes|Perforated pipe]]  
*[[Pipes|Perforated pipe]]  
*[[Geotextiles|Filter fabric a.k.a geotextile]]
*[[Geotextiles|Filter fabric a.k.a geotextile]]
==Planning considerations==
==Design==
==Design==
<h3>Sizing</h3>
<h3>Sizing</h3>

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