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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:
    <br>
*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>
    <br>
     <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>

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