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*Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material) with a minimum inside diameter of 100 mm.
*Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material) with a minimum inside diameter of 100 mm.
**Where freezing is a concern, horizontal underdrain pipes should be over-sized to a minimum 200 mm diameter.
**Where freezing is a concern, horizontal underdrain pipes should be over-sized to a minimum 200 mm diameter.
*Non-perforated pipes should be used for conveyance to and away from the facility, including overflow.
*Non-perforated pipes should be used for conveyance to and away from the facility, including overflow.
**To function correctly, the capacity of the overflow pipes must be greater than the inlet(s).
**To function correctly, the capacity of the overflow pipes must be greater than the inlet(s).
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Perforated Pipe 550x550.jpg| Pipe
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[[Category:Materials]]
[[Category:Materials]]