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→Underdrain
===Underdrain===
===Underdrain===
Stormwater planters differ fundamentally differ from [[bioretention]] in that the storage function is provided only by the [[water retention capacity]] of the [[filter media]].
As such there is no purpose to a storage reservoir and the only purpose to the aggregate layer is to drain water to the [[perforated pipe]]. For this, a medium aggregate as described in [[choker layer]] is recommended as it negates the need for a separating layer to the filter media.
[[Underdrains#Underdrains for non-exfiltrating practices|Underdrain]]
[[Underdrains#Underdrains for non-exfiltrating practices|Underdrain]]