Turbidity Curtain Construction

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Turbidity Barrier Models

Hello. I have questions about the turbidity curtain construction. Is the curtain designed to let water pass through while screening out sediment? I am interested in a Type 2 barrier and would like more information on how the barrier is designed.

turbidity curtainThe turbidity barrier is designed in a couple of different models depending on which type will best fit your site location and control application. In general, the Silt Barrier can be made in either a permeable or impermeable model. Typically, most turbidity barrier are designed to contain sediment so they feature an impermeable skirt. However, if you have a significant flow or depth in your area, a permeable skirt may be advised to help prevent pressure from building up on your barrier.

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Turbidity Curtain Construction

In general, a turbidity barrier (also referred to as a turbidity curtain or silt barrier) is designed with the following components:

  • Top Flotation Device
  • Permeable or Impermeable Skirt
  • Bottom Ballast Chain
  • Section Connectors

This design helps to create a control and containment device that can handle turbidity and silt both below and above the surface of the water.

In terms of standard design, each barrier is typically equipped to provide containment around an area of construction or increased turbidity. It is usually advised that the depth of your barrier should allow for approximately 1 foot of clearance between the bottom of the curtain and the floor of your water location. This allows water to flow underneath the curtain, helping to prevent too much pressure from building up on the curtain.

Permeable Models

type 2 silt barrierAs mentioned above, each barrier is typically designed with either a permeable or impermeable skirt. Impermeable skirts tend to be more common as they block all sediment and turbidity. However, if you have a high flow or require an extended depth, permeable skirts may be recommended to allow water to continue to flow through the barrier.

The permeable turbidity skirt takes the standard barrier design and adds filter panels throughout the skirt. Filter panels are made using a geotextile material and allow water to flow through the skirt while still filtering out silt and turbidity.

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