U.S. Barricades Type II DOT Turbidity Curtain, also known as silt barriers, consist of a top flotation boom, impervious fabric curtain extending downward under water, and a heavy galvanized steel chain sealed into a hem along the entire bottom of the curtain. This provides ballast to keep the curtain vertical in the water, and hems are sealed around a rope with grommets to allow attachment to each other with rope or bolt/nuts/washers.
Type II DOT Turbidity Curtains are use on for lakes, streams, intercostal and tidal areas where current velocities up to three feet per second are expected. Typically has a top load cable and special stress plates for reinforcing the corners
Turbidity curtains are manufactured in three basic types for different water conditions and project needs - Type I, II and III for slow, medium, and fast moving waters, respectively. Depending on the state or locale, variations to these basic types/specifications exist and are often tailored for specific project needs. U.S. Barricades manufactures turbidity curtains to specification for many state DOT requirements in addition to the standard types. Turbidity curtains and silt barriers are made in the United States.