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Geotextiles (view source)

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<p>Primary considerations are:

<ol>

~~<li>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>Maximum forces that will be exerted on the fabric (i.e., what tensile, tear and puncture strength ratings are required?);</li>

<li>Load bearing ratio of the underlying native soil (i.e., is geotextile needed to prevent downward migration of aggregate into the native soil?);</li>

<li>Load bearing ratio of the underlying native soil (i.e. is the geotextile needed to prevent downward migration of aggregate into the native soil?);</li>

<li>Texture (i.e., grain size distribution) of the overlying ~~aggregate~~ material; and</li>

<li>Texture (i.e., grain size distribution) of the overlying fill material; and</li>

<li>Permeability of the native soil</li>

<li>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>

<caption>Recommended criteria for selection of geotextile fabric</caption>

<tr class="success"><th>Percent media passing 0.075 mm (#200 sieve)</th><th>Non-woven fabric apparent opening size (AOS, mm)</th><th>Woven fabric percent open area (POA, %)</th><th>Permittivity (sec<sup>-1</sup>)</th></tr>

<tr><td align="center" valign="middle">>85</td><td align="center" valign="middle"rowspan = 2>≤ 0.3</td><td align="center" valign="middle">Not recommended</td><td align="center" valign="middle" rowspan = 2>0.1</td></tr>

</table>

</p>

Jenny Hill

Bureaucrats, Administrators, Widget editors

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Geotextiles (view source)

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