Silt fencing has been appropriately termed as it matches the meaning, fencing off the silt. Factually and theoretically that is what it means. Silt fence is alternatively known as a filter fence. This is an extra device used to control soil flow and it is also at times used as a device meant for construction material flow.
This device is essentially used to control and maintain the quality of water near or in construction sites and also to protect the quality of water in the nearby streams, rivers or may be even lakes. The quality of water in these natural water bodies can be controlled using this mechanism of filter fencing from silt or lose soil that can actually run off in water into these water bodies.
A typical filter silt fencing essentially consists of special type of filter fabric (technically referred to as Geotextiles) strung along a series of stakes either metal or wooden, normally on a flat or near flat surface along a contour level or in extreme cases along the perimeter of the construction site.
Geotextiles are basically fabrics which permit water to drain out leaving any kind of silt back in the fabric. Three types of geotextiles are generally available namely woven, needle punched and heat bonded. Woven ones look identical to the material used for making mail bags. Needle punched look like felt. Heat bonded is simply ironed felt. These various fabrics are used basically to detach, deplete, and strengthen the soils in which these are used.
Silt fencing necessarily means setting up of basic fence stakes alongside a curve line. Then the fabrics are hanged along the preset stakes facing downwards. The bottom section of the fabric is fixed strongly within the soil so that there is certain amount of firmness in the fence.
This makes sure that any kind of silt filled water when passing through this will deposit the silt on top of the fabric and lets the water alone to drain. This consequently guarantees that the water bodies that are close to the site do not get contaminated.
Effectively this innovative technology in construction makes sure that the material used for construction does not flow away from the premises and also the soil present at the construction premises does not spoil the lakes or rivers that are close by.
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