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[[File: Geotextile-GSI.JPG|thumb|The properties of geotextiles vary widely.]
Geotextiles can be used to prevent downward migration of smaller particles in to larger aggregates, and slump of heavier particles into finer underlying courses.
Geotextiles can be used to prevent downward migration of smaller particles in to larger aggregates, and slump of heavier particles into finer underlying courses.
The formation of biofilm on geotextiles has also been shown to improve water quality:
The formation of biofilm on geotextiles has also been shown to improve water quality: