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, a property found critical to long term filtration, are unique to woven monofilaments. Values ³4% indicate that a sufficient quantity of ‘direct paths’ through the fabric exist to allow for the release of troublesome migrating fines. The subsequent formation of a free flowing filter cake against the surface of a free flowing filter fabric is the designers’ insurance against long term clogging of their systems. |