: a concealed drain with openings through which the water enters when the water table reaches the level of the drain
an underdrain below a filter bed
: to drain by forming an underdrain
underdrain a meadow
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“Underdrain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underdrain. Accessed 26 Nov. 2024.
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