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Geotextiles
Woven Geotextiles For Filtration
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Monofilament filter fabric placed on a shoreline
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Monofilaments are woven geotextiles that offer a combination of high strength and excellent hydraulic characteristics. This makes monofilaments the filter fabric of choice for bulkhead and erosion control applications. These particular woven geotextiles have a high Percent Open Area (POA). Percent open area is the area of distinct, uniform and measurable openings in a filter fabric. The high POA of a monofilament woven geotextile assures that both water and problematic soil particles have direct paths through the fabric. Nonwoven, woven slit film and combination fabrics have little or no Percent Open Area compared to a monofilament woven geotextile and therefore often trap soil particles and clog.
 To determine when a geotextile becomes clogged, a gradient ratio test is performed. Gradient ratio is defined as the ratio of the average hydraulic gradient across the fabric and the 1" of soil immediately next to the fabric, to the average hydraulic gradient across the 2" of soil between 1" and 3" above the fabric.
The US Army Corp of Engineers determined that if a gradient value exceeded 3, the fabric is considered clogged. Tests were conducted to determine what geotextiles resisted clogging, based on the gradient ratio. The results of 6 types of geotextiles are presented in the graph below. Take note of the performance of the monofilament woven geotextiles:
| Woven Filtration Products |
In addition to our standard roll sizes, US Fabrics offers our monofilament woven geotextiles in custom widths and lengths, eliminating waste and reducing expensive overlaps. By using an over edge J Seam with a 401 lock stitch, seam strength approaches 90% of the woven geotextile strength.
• Bulkhead, seawall and shoreline erosion control
| Published values are historical minimum average roll values and are subject to change. |
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* AASHTO M288-99
survivability level |
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"The greater the percent open area, the better the filtration performance and resistance
to clogging."
-Haliburton, T.A., Wood, P.D.
Evaluation of the U.S. Army Corps of Engineers Gradient Ratio Test for Geotextile Performance
The Second International Conference on Geotextiles, Las Vegas,
U.S.A. 1982
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