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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 in order to facilitate easy maintenance. Otherwise see advice above regarding connectors.
+Where possible the underdrain pipe should be designed without any bends for ease of inspection maintenance. Otherwise see advice above regarding connectors.
*To promote infiltration the base of the gravel reservoir and the underdrain pipe should be horizontal to optimize distribution of the water within.
*To promote infiltration the base of the gravel reservoir and the underdrain pipe should be horizontal to optimize distribution of the water within.