There was an article on the problem that few people document them in a
recent book called "Reconsidering Fieldwork."
Jones & Richardson reference a ppaper in "Water management in the English
landscape" (Edinburgh, 1999): "Arable land drainage in the early nineteenth
century." Might have some useful references.

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Has anyone done any research on agricultural drainage tiles? How much of an
agricultural field is disturbed from the installation of drainage tile?
Are/were the tiles installed at an average depth? Does anyone know of any
reference material on this topic?