Silt fence is the most common means of sediment control off construction sites. There are a range of fences available dependant on the site. Standard fences are manufactured from woven geotextile (low risk up to 12 months) while premium fences are a composite of both woven and nonwoven (used specifically in high risk areas and for long periods of time). Silt fences should be trenched (minimum 100mm) in at the base and attached to posts/pickets (minimum 2.5m intervals). Maintenance to clear silt buildup against the fence is crucial to the operation of the system. Left unchecked they can clog and cause water to flow around instead of through the fence.
|Silt Socks are a very useful tool for sediment control ON HARDSTAND areas, that is where you are unable to erect and trench in silt fence. Used extensively around stormwater inlets, however this practice can lead to overflow and we recommend siltsocks are placed in a V at intervals along gutters to dissipate flow and capture silts prior to getting near the SIP. Also a very handy alternative to rock check dams.
Manufactured from nonwoven geotextile and generally filled with sand or aggregate on site. Can be manufactured to specific requirements, although standard socks are 200mm diameter x 50m on length and are rolled onto a spool and simply cut to suit required length then tied off with cable ties.
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|Silt/Sand bags are once again an option when silt fence cannot be installed. Used frequently for rock check dams and basic sediment control on hardstand areas. Available in both woven and nonwoven fabric and generally filled on site with sand or aggregate. The nonwoven is a stronger bag and will last longer than the standard woven.
DEWATERING FILTRATION BAGS
|This relatively new technique of sediment control is very useful in meeting sediment control requirements for construction sites. Small dewatering applications can sometimes be required on even small construction sites. Filter Bags are manufactured from a heavy nonwoven goetextile specifically for this purpose. Muddy, sediment laden water is pumped from the site and discharge into a "filter bag" where almost all suspended sediments are contained. The clean water then discharges through the walls of the bag. All bags have a neck for pump connection and eyelets to anchor if necessary.
|CLICK here to download a brochure on Filtration Bags.pdf|