Silt fences, geotextiles

Use of geotextiles in silt fences, which consist of geotextiles placed vertically on posts to prevent eroded material from being transported away from the construction site by runoff water. 

The line fraction filtration test (Sansone and Koemer, 1992) can also provide valuable information about the long-term behaviour of filter fabric. In this test, the geotextile specimen is subjected to the flow of a mixture of water and soil. It may be particularly interesting for evaluating geotextile performance in silt fences in erosion control works. Palmeira and Farias (2000), eg, reported on test series in which slurries were used with soils from erosion in Brazil. The results showed that often the flow rate tended to stabilize even though conventional design would not recommend that use. 

Erosion control Geotextiles reduce soil erosion caused by rainfall impact and surface water runoff. For example, temporary geosynthetic blankets and permanent lightweight geosynthetic mats are placed over the otherwise exposed soil surface on slopes. Geotextile silt fences are used to remove suspended particles from sediment-laden runoff water. Some erosion control mats are manufactured using biodegradable wood fibers and related biomass. 

In light of these regulations, the earliest use of geotextiles in commercial projects was for the sediment control and stabilization of construction entrances. Sht-fihn wovens used in silt fences with specific opening sizes were required by soil... 

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