DOT Curtain Types

DOT Curtains Type

What DOT Curtain type do I need?

Federal and state regulations require strict management of turbidity and sediment levels. Under the Clean Water Act and the National Pollution Discharge Elimination System (NPDES), these requirements are enforced by government agencies. One of the most effective ways to comply is by using floating turbidity (silt) curtains.

The Department of Transportation (DOT) specifies three types of turbidity curtains, each designed for different conditions. ACME Environmental produces all three types to provide a reliable solution for silt and sediment control at construction sites, discharge points, dredging operations, and remediation projects:

  • DOT Curtain Type I
  • DOT Curtain Type II
  • DOT Curtain Type III

 

Explanation of DOT Curtain Types

DOT Curtain Type I

    • Usage Conditions: Type I curtains are intended for calm waters with minimal current, low wind, and limited wave action—such as ponds, small lakes, or very slow-moving streams.
    • Design Features: Often a lighter-duty design with basic floatation and skirt materials. Minimal anchoring requirements.
    • Typical Applications: Short-term projects, still-water locations, or anywhere water conditions are not expected to be turbulent.

 

DOT Curtain Type II

    • Usage Conditions: Type II curtains are best suited for moderate water flow, moderate wind, and small to medium wave activity.
    • Design Features: Stronger materials and more robust floatation than Type I. May include top tension cables or added ballast to handle moderate currents.
    • Typical Applications: Inland waterways, lakes with moderate wind conditions, and streams with a noticeable current or light tidal influence.

 

DOT Curtain Type III

    • Usage Conditions: Type III curtains are the heaviest-duty option, designed for areas with significant currents, waves, and wind—such as large lakes, rivers with swift currents, or coastal/tidal zones.
    • Design Features: Reinforced construction, heavy-duty floatation, tension cables, and robust anchoring systems to withstand demanding environments.
    • Typical Applications: Large-scale dredging projects, high-flow river segments, coastal construction, or open-water remediation where strong water movement is anticipated.