Chatoyer Environmental has manufactured over 150,000m of silt curtain since 2009. These floating turbidity curtains have been deployed in various projects around Australia, New Zealand and in Papua New Guinea, New Calendonia, Fiji and Vanuatu.

Australian Made. Reliable Chatoyer Quality.

Our use of high-quality materials, attention to detail and workmanship excellence has resulted in Chatoyer leading the market in quality silt curtain fabrication. Chatoyer Environmental’s floating turbidity curtains have a reputation for reliable performance and durable construction.

We manufacture to your specifications.

  • Silt curtain design service and hydraulics evaluation available
  • Range of material options to suit design requirements
  • Handles and hardware built-in to assist with rapid deployment
  • Manufactured in half metre increments up to 20m deep
  • Any order can be packaged pre-connected and ready to deploy
  • Complete design, supply and install consultations

Applications

Silt curtains are generally required by marine service companies, construction companies, erosion and sediment control contractors, consultants, councils and state road authorities for the following types of projects:

  • Bridge building
  • Road widening on foreshore
  • Road repairs on foreshore
  • Port development
  • Dredging
  • Jetty development
  • Piling
  • Foreshore development
  • Tailings dams
  • Sediment ponds

Chatoyer Silt Curtain Designs

Our popular designs are categorised into types we refer to as a Class, each based on functionality that generally suits common applications and operating sea states. The range of curtains is made in 20m lengths. Multiple lengths are connected to span the required length. Floating silt curtain can be customised to suit specific project requirements such as project longevity, operating sea states and government regulations to name a few. For permanent or heavy-duty turbidity curtains, upgrades of materials, components and external floats are available.

Please Note: Chatoyer Environmental does not recommend a purchase decision be made solely by referencing this chart. Advice should be obtained from project specific guidelines and environmental experts to determine silt curtain design requirements. Chatoyer Environmental will not warrant workmanship of silt curtains without submission and approval of the Silt Curtain Design Questionnaire.

Download The SILT CURTAIN DESIGN QUESTIONNAIRE

CLASS 1

Low-Risk Applications

Little to no tidal, wave and/or wind forces.

Example: lagoon, pond, stream

Chatoyer Silt Curtain Design Class 1 Autocad Profiles
Chatoyer Silt Curtain application class 1 rockwall excavation in waterway

CLASS 2

Medium-Risk Applications

Moderate wind and/or water forces.

Example: river, calm harbour

Chatoyer Silt Curtain Design Class 2 Autocad Profiles
Chatoyer Silt Curtain application Class 2 along bank of tidal river

CLASS 3

High-Risk Applications

Strong wind and water forces.

Example: open ocean, harbour, river mouth

Chatoyer Silt Curtain Design Class 3 Autocad Profiles
Chatoyer Silt Curtain application Class 3 in open harbour during land reclamation

How Do I Choose the Right Curtain?

Chatoyer has been manufacturing silt curtains since 2009 and can provide this simple categorisation to assist our clients in selecting an appropriate silt curtain design. Below is a guide showing our suggestions per waterway and the fundamentals of each design class.

Please Note: Chatoyer Environmental does not recommend a purchase decision be made solely by referencing this chart. Advice should be obtained from project specific guidelines and environmental experts to determine silt curtain design requirements. Chatoyer Environmental will not warrant workmanship of silt curtains without submission and approval of the Silt Curtain Design Questionnaire.

Download The SILT CURTAIN DESIGN QUESTIONNAIRE
Chatoyer Silt Curtain Design Selection Guide part 1 - IMPORTANT NOTICE: This is an informational guide only. Configurations are determined by known hydrodynamic conditions such as tidal movement, wind velocity and wave height. Chatoyer Environmental does not recommend a purchase decision be made solely by referencing this chart. Advice should be obtained from project specific guidelines and environmental experts to determine Silt Curtain design requirements. Chatoyer Silt Curtain Design Selection Guide part 2 - IMPORTANT NOTICE: This is an informational guide only. Configurations are determined by known hydrodynamic conditions such as tidal movement, wind velocity and wave height. Chatoyer Environmental does not recommend a purchase decision be made solely by referencing this chart. Advice should be obtained from project specific guidelines and environmental experts to determine Silt Curtain design requirements.
Download the Silt Curtain Selection Quick Reference Guide

How Are the Curtains Supplied?

Chatoyer Environmental supplies silt curtains with the skirt furled and multiple sections connected up to a length of 100 metres per pallet. This enables immediate deployment of the silt curtain on site.

When projects require a large length of silt curtain resulting in numerous pallets, each pallet will be clearly identified and numbered. Pallet sections will be joined in consecutive fashion and pallets should be laid down as near as possible to the deployment zone.

How Deep Should the Silt Curtain Be?

Since the purpose of a silt curtain is to disrupt the water flow and allow the suspended sediment to settle, your curtain should be deep enough to facilitate the following:

  • Provide sufficient disruption to the water flow (current)
  • Remain clear from the sea bed at low tide
  • Where required, adhere to EPA or other environmental requirements

Allow a minimum half metre gap between the curtain and the sea bed at low tide. Silt curtains are intended to promote the settling of sediment by driving particles closer to the sea bed. Water will always find the path of least resistance, therefore the water will pass between the lower edge of the silt curtain and the sea bed. Sediment must be forced deep enough to improve settlement. The gap between the curtain and sea bed provides a significantly more effective pressure release than the porosity of geotextile.

The deeper the curtain, the greater the hydraulic loading which can cause the curtain to flare, resulting in additional horizontal loads. Further, if the curtain penetration is too great, the water that passes beneath the silt curtain will be squeezed through a small gap resulting in possible further erosion of the sea bed and a resuspension of particulate into the upper water column further downstream.

How Do I Ensure the Curtain Effectiveness?

Silt curtain effectiveness is considered as the degree of turbidity reduction achieved within the controlled area relative to the turbidity levels outside of the area. Factors which affect this effectiveness are:

  • The quantity and type of material in suspension
  • The characteristics, design and construction of the silt curtain
  • The mooring and square metre area of the silt curtain deployed
  • Deployment location and positioning
  • The hydrodynamic conditions experienced such as tidal movement, wind velocity and wave height

The silt curtain is not designed to dam the turbid water. Instead, it provides a control for the dispersion of the sediment laden water and allows this suspended silt to settle. It is widely accepted that the interaction between the water column and silt curtain is a crucial factor in determining the efficiency of the silt curtain. It is integral to the silt curtain design that the hydrodynamic loads are understood. These loads are the forces applied to the moorings and silt curtain resulting from currents, winds and waves. These forces can affect the buoyancy and ballast ratio, optimal skirt depth and choice of moorings and anchors.

How Do I Install the Silt Curtain?

One of the critical reasons for a silt curtain failure is that the installation was not completed correctly or with enough diligence. This can then be further impacted by a lack of maintenance program. We strongly recommend that a professional service is employed to install your system. A failure of the Silt Screen can be avoided if care is taken at the front end.

To assist with installation, ensure a large enough area is available to work with the silt curtain prior to deployment. Access to the waterways should be understood and coordinated in advance of the installation. The anchoring system needs to be installed in the waterway prior to deploying the silt curtain. Once the desired length of silt curtain is connected, the furled curtains can be towed to the desired deployment location at a maximum speed of two to three knots. Ensure the curtain remains furled and is secured to the anchoring system. After the furled curtain has been anchored, the curtain should be checked to confirm the skirt is not twisted around the flotation chamber. Once the furled and untwisted curtain is anchored in the right location, remove the ties furling the curtain and allow the silt curtain system to drop into place.

How Do I Remove a Silt Curtain?

To recover the silt curtain, disconnect the silt curtain from the anchoring points and furl the curtain skirt. Then remove the mooring systems. Tow the system back to the launching site for removal from the waterway and responsible disposal.

Are Silt Curtains Reusable?

Silt curtains can be cleaned and properly stored for reuse. If the curtain has been inspected, is in good condition and deemed suitable for reuse, it can be cleaned down with a high-pressure washer to remove biofouling, silt and sediment from the geotextile.

Once thoroughly dry, the curtain can be repacked on a pallet and stored. If serviced and stored properly, a high-quality silt curtain system can be reused numerous times.