Subsoil pipe drain
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1. A system of perforated pipe laid in gravel-filled trenches beneath the topsoil. See also Pipe drain.
This photo shows one application of a subsoil pipe.
Source: http://www.plastream.com/product_range.html
This photo shows the inside of a subsoil pipe drain and the perforations it has.
Source: http://www.plastream.com/product_range.html