Where phreatophyte plants grow (a deep-rooted plant that obtains water from the water table or the layer of soil just above it), groundwater is more likely. From Wordnik.com. [Chapter 10] Reference
Another reason for considering lining of tertiaries is heavy infestation with phreatophyte plants (particularly bull-rushes or "typha") in areas of perennially high watertable. From Wordnik.com. [Chapter 13] Reference
The wet ground conditions at the bottom of a drainage channel in which seepage water is flowing year-round promote heavy growth of phreatophyte plants, requiring frequent cleaning. From Wordnik.com. [Chapter 14] Reference
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