IWT Supplies Fish Exclusion Barriers for River Capping Project


IWT and Spilldam Environmental continue their tradition of innovative designs for specialty containment and turbidity curtains for the marine industry by supplying the fish exclusion barriers to the J. F. Brennan Company for a Connecticut River capping project.  The purpose of a fish exclusion barrier is to protect resident, transient fish and marine life from entering active work zones.

By combining the traditional concept of a floating permeable turbidity curtain with a small opening safety grid system with heavy ballast, the fish exclusion barrier provides a bottom seal and safety shield to keep fish out while allowing dredging or capping to safely take place within the zone.  The permeable skirt allows free water flow and can handle significant water flow and velocity without causing skirt lift which can be a problem with traditional barriers in a high flow river or stream.  In addition, each fish exclusion barrier is checked regularly to make sure of bottom contact and proper alignment to ensure its effectiveness.  This design has been used successfully in New Bedford to protect flounder, the Potomac River to protect striped bass and in St. Maries, Idaho to protect native trout.

If you have a design concept for a marine barrier or curtain that you would like developed further, please contact Peter Daly at IWT.  We’ll be happy to turn your idea into a finished product.