Woven monofilament geotextiles are most frequently specified to perform at least one of the following functions:
Only woven monofilament geotextiles can provide 'long-term' solutions for nearly any drainage / filtration application, thus making them the filter fabric of choice for bulkheads, subsurface drainage systems and under hard armor.
Effective levels of Percent Open Area (POA), a property found critical to long-term filtration is unique to woven monofilaments. Values ≥4% indicate that a sufficient quantity of distinct, measurable, uniform and unidirectional paths through the fabric exist to allow for the release of troublesome migrating fines – the nemesis of all other filter fabrics, regardless of where they approach the geotextile.
This allows for the formation of a mini-graded 'filter cake' against the surface of the free-flowing 'filter fabric', and is the designers' only insurance against long-term clogging of their filtration systems.
(See Technical Note regarding Percent Open Area (POA) at the bottom of this page.)
Carthage Mills' woven monofilaments were America's first filter fabrics and the only ones that have been used successfully for more than 50 years (see First 'Filter Fabrics' below).
They can be found in literally tens of thousands of projects designed and managed by the US Army Corps of Engineers; all levels of foreign and local governments; and private entities around the world.
Individual product selection for each project should be dependent on its primary function, site conditions and the criticality of long-term performance.
However, Percent Open Area (POA) is the single most important property to consider when hydraulic gradients are medium to high, long-term filtration is critical, internal migration of fines may occur, and/or even partial clogging of the fabric could result in failure of the project.
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Carthage 6%™ and Carthage 4%HD™ meet or exceed the minimum requirements for several Applications of the AASHTO: M 288-15 Geotextile Specification for Highway Applications; see the:
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