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Underdrains comprise a length of perforated [[pipe]] embedded into a layer of [[reservoir aggregate]]. They are an optional component of [[bioretention]] systems, [[stormwater planters]], [[swales]] and [[tree wells]]. Their design varies according to the drainage requirements of the installation, and the available maintenance access.
Underdrains comprise a length of perforated [[pipe]] embedded into a layer of [[reservoir aggregate]]. They are an optional component of [[bioretention]] systems, [[stormwater planters]], [[swales]] and [[soil cells]] used to support urban [[trees]]. Their design varies according to the drainage requirements of the installation, and the available maintenance access.
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