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[[File:underdrain-subgrade.jpg|300px|thumb|right|Underdrain installed to subgrade.]]
[[File:underdrain-subgrade.jpg|300px|thumb|right|Underdrain installed to subgrade.]]
[[File:underdrain-with-risers.jpg|300px|thumb|right|Underdrain installed with maintenance risers. Note the 'T' joints, which are no longer recommended.]]
[[File:underdrain-with-risers.jpg|300px|thumb|right|Underdrain installed with maintenance risers. Note the 'T' joints, which are no longer recommended.]]
====Underdrains====
===Backfill Granular, Utilities and Pipes: Underdrains===
[[Underdrains]] are perforated pipes that  collect subsurface water and convey water out of an LID facility once it reaches capacity. Their design is determined by the drainage requirements of the feature.
[[Underdrains]] are perforated pipes that  collect subsurface water and convey water out of an LID facility once it reaches capacity. Their design is determined by the drainage requirements of the feature.


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