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Permeable Silt Curtains

Turbidity Curtains With Geotextile Filter Screens

Built for demanding conditions, permeable silt curtains are specifically designed for silt and turbidity control in areas with fast water, waves or other challenging environments. Permeable turbidity curtains (also known as silt curtain or silt barriers) feature a geotextile filter panel or window to relieve pressure on the curtain and allow faster water flow through while still are very efficiently containing silt and turbid water.

Permeable Silt Curtain Features

  • Choose from Type 1, 2 or 3 models
  • Geotextile filter fabric provides the curtain's filtration properties
  • Can be customized to fit job specs

Permeable Silt Curtain Benefits

  • Options let you pick the model to fit project site conditions
  • Provides filtration of turbidity from containment area
  • By permitting some flow, it can lessen pressure on the curtain

Type 1 Geo Permeable Silt Curtain Details

The Type 1 Geo Curtain is unlike any of our other floating turbidity curtains. While most permeable models feature a geo panel within the skirt, Type 1 Geo Curtains feature a construction that is made entirely of 8 oz. filter fabric. This reduces the pressure put on the silt screen by allowing water to continue flowing through the curtain while filtering silt and giving it time to settle. The geotextile fabric's permeable properties increase the curtain's ability to filter and is is well suited for areas with low flows and temporary containment requirements. Geo curtains are commonly used in:

  • Ditches
  • Canals
  • Shallow Streams
  • Low Flow Areas

Type 2 and Type 3 Permeable Silt Curtains Details

Type 2 and Type 3 Permeable Silt Curtain is for use in marine construction that's located in waters with currents greater than 1 knot, or that are prone to waves or tides. For these conditions, the permeter of th permeable silt curtains need to be reinforced with pvc fabric to addd strength and durability. This design still meets compliance requirements for sediment containment, yet permits filtered flow-through to relieve strain on the curtain.

Type 2 HD Permeable Turbidity Curtains:

  • Top Tension Cable Below the Float
  • 22 oz. Fabric
  • 6 oz. Monofilament
  • Universal Bulk Connectors
  • HD Reinforced Stitching

Type 3 DOT Permeable Silt Curtains:

  • Top Tension Cable Above the Float
  • 18 oz. PVC Fabric
  • 6 oz. Monofilament Filter Fabric
  • Bottom Ballast Chain
  • Top Stress Plate Connectors
  • HD Reinforced Stitching

Type 3 HD Permeable Silt Curtains:

  • Dual Top Tension Cable Below the Float
  • 22 oz. PVC Fabric
  • 6 oz. Monofilament Filter Fabric
  • Bottom Ballast Chain
  • Top Stress Plate Connectors
  • HD Reinforced Stitching

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Type 1 Permeable Silt Curtains - Options & Specifications

Flotation 4" or 6" Float
Fabric 8 oz. Nonwoven Geo
Filter Fabric 8 oz. Nonwoven Geo
Section Connectors Grommets
Skirt Connector Grommets
Bottom Connectors Grommets
Tension Cable N/A
Bottom Ballast Chain 5/16" Ballast Chain
Standard Length 50'

Type 1 Contractor Turbidity Curtain Specifications

Flotation 6", 8", or 12" Float
Fabric 22 oz. PVC
Filter Fabric 6 oz. Monofilament Geotextile
Section Connectors Universal Bulk Connectors
Skirt Connector Grommets
Bottom Connectors Steel Stress Plates
Tension Cable 5/16" Cable
Bottom Ballast Chain 5/16" Steel Ballast Chain
Standard Length 50' or 100'

Type 1 Permeable Turbidity Curtain Specifications

Flotation 6" or 8" Float
Fabric 18 oz. PVC
Filter Fabric 6 oz. Monofilament Geotextile
Section Connectors Steel Plate
Skirt Connector Grommets
Bottom Connectors Steel Stress Plates
Tension Cable 5/16" Tension Cables
Bottom Ballast Chain 5/16" Steel Ballast Chain
Standard Length >50' or 100'

Type 1 Permeable Turbidity Curtain Specifications

Flotation 8" or 12" Marine Grade Flotation
Fabric 22 oz. PVC
Filter Fabric 6 oz. Monofilament Geotextile
Section Connectors Universal Bulk Connectors
Skirt Connector Grommets
Bottom Connectors Steel Stress Plates
Tension Cable 5/16" Dual Tension Cables
Bottom Ballast Chain 3/8" Steel Ballast Chain
Standard Length 50' or 100'

Permeable Silt Curtain Fabric and Components and Applications

When using silt screens in salt water we recommend upgrading the tension cables and connectors. While standard barriers come with galvanized steel components, stainless steel or zinc anode additions are preferredfor salt water or other corrosive environments. These additions will help prevent corrosion and increase the life span and performance of your permeable silt barrier. Alternative fabrics are also available for extended deployment in areas with high pH levels, high or low temperatures or in areas where chemicals are present.

Permeable Silt Curtains Frequently Asked Questions

Permeable turbidity curtains are typically offered in three different models: Type 1 Geo Curtain, Type 2, and Type Permeable Curtain. While standard differences exist between the various models (bottom cable, tension cable), the main difference lies in the fabric and construction, designed to fit certain project site conditions.

Permeable Silt and Turbidity Curtains are most commonly used in areas where some flow through is required either due to project requirements, high currents or extreme pressure. The bottom filter panel reduces pressure on the curtain by allowing water to flow through at a faster rate, while still containing silt.