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===Design===
===Design===
<p>An underdrain comprises a length of perforated pipe embedded into a reservoir gravel layer. A pair of small wells are recommended to inspect and periodically flush accumulated sediment from the underdrain pipe.
<p>An underdrain comprises a length of perforated pipe embedded into a reservoir gravel layer. A pair of small wells are recommended to inspect and periodically flush accumulated sediment from the underdrain pipe.</p>
*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.
*Where drainage or conveyance to a downstream facility is a greater priority, the base of the reservoir and the underdrain pipe may have a gradient of up to 1-2%.
*Where drainage or conveyance to a downstream facility is a greater priority, the base of the reservoir and the underdrain pipe may have a gradient of up to 1-2%.