The Road Drain Curb and Gutter is used whenever a below grate sediment collection trap is needed. This patented product has a unique curb back that block storm water from entering storm sewer and forcing the water to enter the box. The standpipe in the box makes sure that your road does not get flooded during an average rain event. The Roaddrain is not a stand-alone BMP; it works in conjunction with other BMPs on site. The Road Drain is your last line of defense for sediment control.