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→Above ground
===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.