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→Above ground
===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.