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<p>Geotextiles prevent downward migration of smaller particles in to larger aggregates, and slump of heavier particles into finer underlying courses.

<p>Geotextiles prevent downward migration of smaller particles in to larger aggregates, and slump of heavier particles into finer underlying courses.

     <br> The formation of biofilm on geotextiles has also been shown to improve water quality:

     <br> The formation of biofilm on geotextiles has also been shown to improve water quality:

*By degrading petroleum hydrocarbons[https://www.icpi.org/sites/default/files/techpapers/1309.pdf]

*By degrading petroleum hydrocarbons<ref>Newman AP, Coupe SJ, Spicer GE, Lynch D, Robinson K. MAINTENANCE OF OIL-DEGRADING PERMEABLE PAVEMENTS: MICROBES, NUTRIENTS AND LONG-TERM WATER QUALITY PROVISION. https://www.icpi.org/sites/default/files/techpapers/1309.pdf. Accessed July 17, 2017.</ref>

*By reducing organic pollutant and nutrient concentrations [http://www.mdpi.com/2073-4441/7/4/1595/pdf]

*By reducing organic pollutant and nutrient concentrations [http://www.mdpi.com/2073-4441/7/4/1595/pdf]

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