Benthic barriers are a bottom covering material designed to separate the growing media from sunlight and prevent or stop the growth of plants in particular areas. Typically benthic or bottom barriers are effective in small areas for swimming or docks.
The use of benthic barrier to restrain growth is an effective management technique in lakes or ponds with small pioneer infestations, or locations where only a small area, typically less than one acre, is targeted for management. Benthic barriers block sunlight from reaching the bottom sediments; thereby inhibiting photosynthesis and preventing growth of the plants they cover. Once large areas of vegetation are managed, benthic screening may be highly effective in beach or dock areas.