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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: |
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| *By degrading petroleum hydrocarbons[https://www.icpi.org/sites/default/files/techpapers/1309.pdf] | | *By degrading petroleum hydrocarbons[https://www.icpi.org/sites/default/files/techpapers/1309.pdf] |
| *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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| <li>The suitable apparent opening size (AOS) for non-woven fabrics, or percent open area (POA) for woven fabrics, to maintain water flow even with sediment and microbial film build-up.</li> | | <li>The suitable apparent opening size (AOS) for non-woven fabrics, or percent open area (POA) for woven fabrics, to maintain water flow even with sediment and microbial film build-up.</li> |
| </ol> | | </ol> |
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| <table class="table table-striped table-responsive"> | | <table class="table table-striped table-responsive"> |
| <caption><strong>Recommended criteria for selection of geotextile fabric</strong></caption> | | <caption><strong>Recommended criteria for selection of geotextile fabric</strong></caption> |
| <tr class="success"> | | <tr class="success"> |
| <th>Percent media passing 0.075 mm (#200 sieve)</th> | | <th class="text-center">Percent media passing 0.075 mm (#200 sieve)</th> |
| <th>Non-woven fabric apparent opening size (AOS, mm)</th> | | <th class="text-center">Non-woven fabric apparent opening size (AOS, mm)</th> |
| <th>Woven fabric percent open area (POA, %)</th> | | <th class="text-center">Woven fabric percent open area (POA, %)</th> |
| <th>Permittivity (sec<sup>-1</sup>)</th> | | <th class="text-center">Permittivity (sec<sup>-1</sup>)</th> |
| </tr> | | </tr> |
| <tr> | | <tr> |