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<li>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. </li>
<li>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. </li>
<li>To function correctly, overflow pipes must be larger in diameter than inlet pipes. </li>
<li>To function correctly, overflow pipes must be larger in diameter than inlet pipes. </li>
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[[Category:Materials]]
[[Category:Materials]]