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→Above ground
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===Above ground===
===Above ground===
−Where possible the underdrain pipe should be designed without any bends for easy inspection and maintenance. Otherwise see advice above regarding connectors.
+Where possible the underdrain pipe should be designed without any bends for easy inspection and maintenance. Otherwise see advice above regarding pipe couplings.
*To optimize water distribution and promote infiltration the base of the storage reservoir and the underdrain pipe should be graded level.
*To optimize water distribution and promote infiltration the base of the storage reservoir and the underdrain pipe should be graded level.