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Turbidity Curtain Barrier - Type 2 DOT - 7' x 50'

$1,300.70

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SKU TUR-7X50-2-DOT

Turbidity Curtain Barrier - Type 2 DOT - 7' x 50'

Model: TC-7X50-D2
Brand: Tough Guy / AER-FLO

Size: 7' x 50'
Product Specifications: Download Printable Spec Sheet >

Lead Time: Please expect a 5-7 business day lead time prior to shipping on this product. 

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PRODUCT INFO:

  • Type 2.DOT is the work horse of the TOUGH GUY® line. It has a top load cable and special stress plates for reinforcing the corners and is designed to handle more severe conditions
  • Recommended for lakes, streams, intercoastal and tidal areas where current velocities up to five feet per second are expected.
  • It is highly recommended that you contact a qualified engineer for assistance when facing these conditions because the anchorage and installation must be designed exactly to meet these situations

Why Buy Turbidity Curtains from Paramount Materials?

  • We only sell the Tough Guy brand commercial-grade curtains which are made in the USA. Widely regarded as the “go to brand” for quality and strict adherence to stated specifications.
  • We do not sell "no-name" or "off-brand" curtains. These economy curtains often claim to meet spec but due to oversees manufacturing variances sometimes do not, leaving the installer exposed to potential fines and project delays.
  • Hate phone trees? So do we. When you call Paramount Materials you get a live person within a few rings, ready to help with product or order questions 5am - 5pm PST.

Tough-Guy® Floating Turbidity Barrier Type 2.DOT

Specifications (ST: 10/08)

Fabric - 18 oz. nominal laminated vinyl/ polyester having the following characteristics: Construction - vinyl laminate on 9x9 1000x1300 denier polyester scrim

Weight – 18.5 oz. per sq. yd (434 gr./sq.m) Adhesion – 24 x 20 lb./2”

Grab Tensile – 410 x 410 lb./in. (430 x 421 daN/5cm.)

Tear - 100 x 100 lb./in. (95 x 95 daN)

Hydrostatic – 600 psi (4167 kPa) Cold resistance to crack: -40° F/C

All seams heat sealed

5.8 inch poly rope reinforced vertical edges

#5 brass grommets

5/16 inc. galvanized steel in plastic sleeve 7 x 19 load cable in top, 9800 lb. break strength (4439 daN)

5/16 in. galvanized chain ballast in bottom

Aluminum stress plates at cable and chain termination

EPS flotation, (8 in. x 8 in. standard), 26.7 lb./ft. buoyancy in fresh water, 28.4 lb./ft in saltwater.

Looking for a Custom Depth Or Length Barrier?

Custom sizes are available on orders of 5+ barriers. Request Quote >

Type 1 Turbidity Curtains

Type 1 Turbidity Curtains

Type 2 Turbidity Curtains

Type 2 Turbidity Curtains

Type 3 Turbidity Curtains

Type 3 Turbidity Curtains

Turbidity Background

The process of capturing debris via turbidity type curtains started in the 70s for the logging industry when nets were suspended from log booms to catch log debris. Later on, the nets were replaced with fabric such as canvas to confine mud and debris. The term “Log” is still used today to describe floating PVC and poly-booms.  A Silt containment barrier is typically an impenetrable device for temporary or long-term use to stop solids or turbidity in the water column produced during dredging and disposing of dredge spoils.

This device is made up of a floater, ballast, and flexible curtain that is made of geo-synthetic fabric. In 1976, the effectiveness of the silt curtain was studied and in 2012, a review covered most of the theoretical and practical aspects of silt curtains including their basic function and main components. In 2010,  an experimental investigation was conducted to examine the hydraulic performance of silt screens using an imaging velocimetry (PIV) technique. Silt curtains were further studied in 2016 for effectiveness with different redistribution methods in the reduction of suspended sediment concentration of the flow intake. In most cases, sediment is found in thin layers close to the bottom with high levels of concentrated sediment.

Turbidiy Curtain Barrier Installed on Shoreline

Turbidity Curtain Barrier Installed in a Shoreline Application

The General Guidelines

The turbidity curtains or silt barrier should be placed parallel to the direction of flow.

For areas that are not susceptible to heavy waves, the curtain height should have enough slack to allow the top of the curtain to reach the maximum expected high-water level, which includes waves, while the bottom stays in constant contact with the bottom of the water body. The bottom edge of the curtain should have a weight system that is capable of holding the bottom of the curtain down and in conformity to the bottom of the water body to prevent the escape of turbid water under the curtain.

For areas susceptible to heavy waves, the curtain height should offer enough slack to allow the top of the curtain to reach the maximum expected high-water level, including waves, while the bottom stays a foot above the bottom. The weight system should hold the lower edge of the curtain in place to allow one foot of clearance above the bottom during low water so the curtain will not stir up sediments while hitting the bottom.

The curtain materials should be in bright colors to attract the attention of boaters or swimmers who are in the same area as the work site.

Installation

If you are dealing with calm water such as found in lakes and ponds, Type I Installation is more than enough to set the curtain end stakes or anchors using anchor buoys if the bottom anchors are used. Then, drag out the curtain in the furled condition and attach it to the stakes or anchor points. After that, any additional stakes or buoyed anchors are needed to maintain the desired location so the curtain can be set and the anchors on the curtain are tight. Only after these steps should the furling lines be loosened to allow the curtain skirt to drop. There are furling systems that can be valuable options that can be included on the curtain for easier installation and removal.

Floating Turbidity Curtain Installed in a Lake

Floating Turbidity Curtain Installed in a Lake Application


In rivers and other moving water, you will need Type II and Type III for installation. It's important to set all the curtain anchor points.  Take care before putting the furled curtain into the water to ensure the anchor points are sufficient for holding and retaining the curtain under the current conditions. Again, anchor buoys should be used on all anchors to prevent the current from submerging the flotation at the anchor points. If the moving water enters where the curtain is being installed it will subject the curtain to currents in both directions as the tide changes, it's important to provide anchors on both sides of the curtain for two very good reasons:

- Curtain movements should be minimized during tidal current reversals.
- The current will not overturn the anchors and pull them when the tide reverses.

Once the anchors are fastened, the furled curtain should be secured first to the farthest upstream anchor point and turned until the entire curtain is in position.  Then before unfurling, the “lay” of the curtain should be examined and any necessary adjustments made to the anchors. Lastly, when the location is established, the furling lines should be loosened to allow the skirt to drop.

Always attach the anchor lines to the flotation devices, not to the bottom of the curtain. The anchoring line should be attached to the downstream side of the flotation device which will provide support for the curtain. Attaching the anchors to the bottom of the curtain can lead to a collapse of the curtain caused by stress on its middle section.

Turbidity Sediment Control Barrier

Turbidity Curtain Installed to Control Sediment

There is an exception to turbidity curtains not being installed cross-channel flows. When there is a danger of creating a silt build-up in the middle of a waterway, which will block access or create a sand bar, curtains have been used effectively in large areas of moving water by forming a very long-sided sharp “V” to deflect clean water around the work site and confine a large portion of the silt water to the work area inside the “V”.  Direct as much as of the silt toward the shoreline.  Show caution not to install the curtain crosswise to the water current.

What A Turbidity Curtain Is And How It Works

The turbidity curtains are barriers used to trap sediment in the water. The curtains are weighed at the bottom so the sediment cannot get underneath the curtains and are supported at the top with a flotation system. These curtains are designed to prevent sediment from work sites from getting into the water.

Turbidity curtains are usually installed so they are parallel to the direction of the flow of water and the height of the curtain should rise to the height of the maximum expected level of water. The bottom of the curtain should always be in contact with the bottom of the body of water and held down by a weight.

Both Floating & Staked Turbidity Barriers

Turbidity curtains are designed to prevent the flow of stormwater runoff loaded with sediment from construction sites. The barriers will keep runoff restrained in a specific and limited area allowing the sediment to settle before being carried into waterways. These turbidity barriers are available in two styles, staked or floating.

Floating turbidity curtains are known as Floating Turbidity Silt Curtains. The barrier is designed with a flotation boom on the top and an impenetrable fabric curtain that extends down under the water. It has a heavy galvanized steel chain that is sealed in the hem that runs along the entire bottom of the curtain. It keeps the curtain vertical in the water. The ends are sealed around a rope and grommeted to allow for the attachments.

There Are 3 Levels of DOT Floating Turbidity Barriers -

Type 1 DOT Turbidity Barrier

Type 1 DOT Turbidity Curtain

The Type 1 Floating Turbidity Curtain Barrier - DOT

This is the most popular barrier in the Tough Guy ® line. This particular barrier is recommended for sites that are located in protected areas that only experience light winds and currents that run less than one foot per second.  The waters are usually ponds, small streams, shallow lakes, or marshes. In order to keep the barrier's position will require anchoring with stakes, concrete blocks, or an anchor kit which is sold separately. There are sections of the barrier that are connected by rope lacing or nylon tiers.

The Type 2 Floating Turbidity Curtain Barrier - DOT

The Type 2 turbidity curtain (DOT) barrier is very popular that has a top load cable and special stress plates for reinforcing the corners and is specifically designed to handle severe conditions. This barrier is highly recommended for areas that have currents that reach up to 5 feet per second. These barriers are found in lakes, streams, inter-coastal, and tides. It's highly recommended you contact a qualified engineer for help when dealing with these conditions because the anchoring and installation must be designed exactly right to meet the conditions. The barrier style is connected in a similar rope lacing and nylon tie system as found with the Type 1 DOT curtain.

Type 2 DOT Turbidity Barrier

Type 2 DOT Turbidity Curtain

Type 3 DOT Turbidity Barrier

Type 3 DOT Turbidity Curtain

The Type 1 Floating Turbidity Curtain Barrier - DOT

This barrier comes with approximately 20% of the skirt fabric is replaced by a polypropylene filter fabric that conforms to some State DOT specifications. The filter fabric is in place to reduce pressure on the curtain while it holds on to silt. The filter fabric is tightly woven to hold on to the silt but will not weaken pressure on the curtain.

Also, if the fabric is not tightly woven, it cannot hold on to the silt and/or sediment particles. The fabric cannot be heat sealed causing a decline in the curtain's strength and longevity.

Summary

Dredging and disposing of dredged material in open water will lead to turbidity by suspending fine-grain particles from dredged materials into the water. Active work sites cause a lot of pollutants to enter water systems and will become overwhelming to the atmosphere.  Silt screens, turbidity curtains, silt barriers, and turbidity barriers are in place to remove sediments from the water. Turbidity curtains have become incredibly popular and important for capturing particles.

It's important to know how to set up these curtains for protected areas not experiencing any currents up to heavy wave conditions.  Installation depends on the activity of the water flow including the activity level of waves.