Soil erosion isn't only a problem for farmers, Niagra Falls and the Grand Canyon. Most construction projects have to contend with the affects of water on excavations not only as a consequence of rainfall runoff but also from ground water intrusion. The mud common to most jobsites at one point or another tracking over roads and clogging drainage ditches and storm sewers has lead to the need for more effective control mechanisms that are "user friendly" and low cost. Textiles have been used for centuries to try to filter out the mud and let the water drain away. Some of the original wellpoints used lamp wick and burlap to separate the water from the soil.

In an effort to keep the mud "corralled" geotextile silt fences are required to be installed as a normal construction practice to allow the water to flow off-site without carrying away the soils. Geotextiles, because of their diversity, light weight, strength and adaptability are finding a prominent place in water-soil management.

Geotextiles generally fall into two categories, woven and non-woven. Woven textiles have a uniform pattern and can be tailored to a specific open area ratio. These are generally thin single layers and are very strong and tear-resistent. Non-woven geotextiles have no pattern and the fibers intertwine to produce thickness. The fabric is generally thicker and less tear-resistent than woven fabrics.

With woven geotextiles the larger the soil particles to be controlled, the more open the weave. Woven fabrics have great strength and are common now for ground cover holding grass seeds and the soil in place, giving the grass time to root and stabilize slopes. More sophisticated approaches weave the grass seeds and matting into the fabric so that the ground cover can be rolled out like a carpet on the bare earth. With the addition of a grass-green color the ground cover gives the appearance of having already germinated.

Silt fences are woven in a graduated weave tighter at the bottom than at the top. This reduces weight and puts the filtering benefit at the ground level where it's needed. Silt fence material is trenched in to anchor the fence against high velocity runoff keeping the soil and debris inside and letting the water get outside.