The True Dam is designed for inlets and median barrier inlets without a grate. This patented design conforms to the shape of the curb with built-in overflow capabilities. The True Dam also meet or exceeds regulatory requirements and reduces or eliminates the need to flush or clean inlets. It's designed to handle the worst that sludge-filled rainwater has to offer. Dandy Curb can filter off sediment laden storm waters. The suspended solids are allowed to settle out of the slowed flow and are easily captured by the Dandy Curb prior to entering the inlet. 14ft in length.