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Silt Fence Filter Kit

$198.00 inc GST

SKU: SF0500G-1

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Silt Fence Filter Kits are a Type 2 Sediment Trap. They are a designed sediment control to adhere to IEACA Best Practice Guidelines (2008) and have extra treatment requirements as detailed in the Queensland’s State Planning Policy (2017). The Silt Fence Filter Kits are a cheaper alternative and are easier to install than traditional Type 2 sediment traps.

Silt Fence Fit includes:

  • A filter sock (3mL x 200mDia) with an inner and outer fabric. 260gsm geotextile outer, 50um filter material inner, tie for securing sock to inlet collar. Flow capability 100L/sec.
  • Inlet collar (200mmDia) with debris filter screen.
  • Plastic support panel.

Optional Extras 

  • Silt Fence roll (50mL). Heavy Duty 100gsm for added strength.
  • Pack of 25 of hardwood timber stakes (25mm x 50mm x 900mm)
  • Fabric for outflow (5m x 1m) & 10 U-shaped pins (150mm)

Features:

  • Kit converts a Silt Fence Type 3 into a Type 2 Sediment Control.
  • Quick to install and maintain.
  • No machinery required for installation.
  • Capable of capturing and holding at least 90% of material larger than 140 microns (under typical flow).
  • Cheaper alternative to rock filter dams, sediment weirs and filter ponds. 
  • Used as an alternative to a silt fence spill through a weir.

Silt fence supplies & products

Silt fences or sediment fences are a temporary structure generally used on construction sites. They are designed to intercept and retain sediment as it travels across exposed soils while allowing drainage.

Generally silt fences are constructed using a filter fabric (also called a geotextile) which can be made of a woven or non-woven material which is entrenched or inserted into the ground to stop the contaminated water getting underneath it. The filter fabric is attached to either timber pegs or steel posts for support.

Silt fences are good at trapping larger sized soil particles like sand and debris but have very little affect on successfully trapping fine soils like clay.

Silt fences are generally considered the last line of defence against erosion and should be used in conjunction with other forms of erosion control methods like rock check dams, jute matting, diversion drains, and sediment or retention basins.

Where should you install Silt Fences?

Silt fences should be installed on a site before soil disturbance (earth moving) begins, down-slope from the construction area. They should always be installed along the contour of the slope you are protecting; if installed incorrectly it will allow water to concentrate, increasing water flow and volume, and the chance of the fence to be undermined and eventually fail.

If installing a silt fence on a downward slope you should be constructing “silt fence returns” or “j’s”, positioned perpendicular to the silt fence. These structures will capture sediment and slow water flow. Silt fences are not designed to withstand high flow rates of water, and should therefore be located where water can form shallow pools within the silt fence.

Where should you install Silt Fences?

Silt fences should be installed on a site before soil disturbance (earth moving) begins, down-slope from the construction area. They should always be installed along the contour of the slope you are protecting; if installed incorrectly it will allow water to concentrate, increasing water flow and volume, and the chance of the fence to be undermined and eventually fail.

If installing a silt fence on a downward slope you should be constructing “silt fence returns” or “j’s”, positioned perpendicular to the silt fence. These structures will capture sediment and slow water flow. Silt fences are not designed to withstand high flow rates of water, and should therefore be located where water can form shallow pools within the silt fence.

The installation process of silt fences

Before any work is carried out, conduct a site inspection insuring there are no hidden electricity cables or water pipes are in the area of operation. The best way to ensure workers safety is to view current plans of the job site or to “Dial Before You Dig”(1100)

Below is a step by step process to install a silt fence by using the trenching method.

Step 1

Determine where the most suitable position for the installation of the silt fence should be, and dig a trench along this line using a trenching machine. The trench should be a minimum of 200mm deep.

Step 2

Hammer the fence stakes or posts into the ground insuring they are secure and positioned on the downward side of the slope, or on the opposite side from where the runoff will be originating. The supporting pegs can be hardwood timber or steel pickets ranging from 900mm to 1650mm high.

Step 3

Attach silt fence fabric to the supporting pegs by either a stapler, tie wire or zip ties.
Make sure the fabric is secure and doesn’t move on the peg as over time these pegs will be under immense strain from the captured sediment and water.

Step 4

Backfill the trench with the excess soil you created with the trenching process, making sure that the fabric is in a “j” position under the ground

Step 5

Pack the soil down into the trench, especially around the pegs as these are the structural points of the fence.

Reasons why Silt Fences may fail

  • Improper placement in the construction site
  • In a concentrated flow path
  • Inadequate trench depth with little or no soil compaction
  • Inadequate attachment of filter fabric to pegs or posts
  • Failure to maintain the silt fence after installation
  • Silt fence not installed along contour producing concentrated water flow.
  • Lack of “silt fence returns” or “j’s” structures
  • Inadequate drainage through construction site
  • Inadequate strength due to insufficient pegs being used

Looking for professional silt fence installation ?

Aussie Environmental can provide a range of service and installation options.

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